Issue 4364 - Drop support for Chrome 29-40 and remove legacy code

include.preload.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 178 matching lines @@
   try
   {
     return element.contentDocument;
   }
   catch (e)
   {
     return null;
   }
 }
 
-function ElementHidingTracer(document, selectors)
+function ElementHidingTracer(selectors)
 {
-  this.document = document;
   this.selectors = selectors;
 
   this.changedNodes = [];
   this.timeout = null;
 
   this.observer = new MutationObserver(this.observe.bind(this));
   this.trace = this.trace.bind(this);
 
   if (document.readyState == "loading")
     document.addEventListener("DOMContentLoaded", this.trace);
@@ skipping 45 matching lines @@
     this.checkNodes(this.changedNodes);
     this.changedNodes = [];
     this.timeout = null;
   },
 
   observe: function(mutations)
   {
     // Forget previously changed nodes that are no longer in the DOM.
     for (var i = 0; i < this.changedNodes.length; i++)
     {
-      if (!this.document.contains(this.changedNodes[i]))
+      if (!document.contains(this.changedNodes[i]))
         this.changedNodes.splice(i--, 1);
     }
 
     for (var j = 0; j < mutations.length; j++)
     {
       var mutation = mutations[j];
       var node = mutation.target;
 
       // Ignore mutations of nodes that aren't in the DOM anymore.
-      if (!this.document.contains(node))
+      if (!document.contains(node))
         continue;
 
       // Since querySelectorAll() doesn't consider the root itself
       // and since CSS selectors can also match siblings, we have
       // to consider the parent node for attribute mutations.
       if (mutation.type == "attributes")
         node = node.parentNode;
 
       var addNode = true;
       for (var k = 0; k < this.changedNodes.length; k++)
@@ skipping 22 matching lines @@
 
     // Check only nodes whose descendants have changed, and not more often
     // than once a second. Otherwise large pages with a lot of DOM mutations
     // (like YouTube) freeze when the devtools panel is active.
     if (this.timeout == null)
       this.timeout = setTimeout(this.onTimeout.bind(this), 1000);
   },
 
   trace: function()
   {
-    this.checkNodes([this.document]);
+    this.checkNodes([document]);
 
     this.observer.observe(
-      this.document,
+      document,
       {
         childList: true,
         attributes: true,
         subtree: true
       }
     );
   },
 
   disconnect: function()
   {
-    this.document.removeEventListener("DOMContentLoaded", this.trace);
+    document.removeEventListener("DOMContentLoaded", this.trace);
     this.observer.disconnect();
     clearTimeout(this.timeout);
   }
 };
 
-function runInDocument(document, fn, arg)
+function runInDocument(fn, arg)
 {
   var script = document.createElement("script");
   script.type = "application/javascript";
   script.async = false;
   script.textContent = "(" + fn + ")(" + JSON.stringify(arg) + ");";
   document.documentElement.appendChild(script);
   document.documentElement.removeChild(script);
 }
 
 // Neither Chrome[1] nor Safari allow us to intercept WebSockets, and therefore
 // some ad networks are misusing them as a way to serve adverts and circumvent
 // us. As a workaround we wrap WebSocket, preventing blocked WebSocket
 // connections from being opened.
 // [1] - https://bugs.chromium.org/p/chromium/issues/detail?id=129353
-function wrapWebSocket(document)
+function wrapWebSocket()
 {
   if (typeof WebSocket == "undefined")
     return;
 
   var eventName = "abpws-" + Math.random().toString(36).substr(2);
 
   document.addEventListener(eventName, function(event)
   {
     ext.backgroundPage.sendMessage({
       type: "request.websocket",
       url: event.detail.url
     }, function (block)
     {
       document.dispatchEvent(
         new CustomEvent(eventName + "-" + event.detail.url, {detail: block})
       );
     });
   });
 
-  runInDocument(document, function(eventName)
+  runInDocument(function(eventName)
   {
     // As far as possible we must track everything we use that could be
     // sabotaged by the website later in order to circumvent us.
     var RealWebSocket = WebSocket;
     var closeWebSocket = Function.prototype.call.bind(RealWebSocket.prototype.close);
     var addEventListener = document.addEventListener.bind(document);
     var removeEventListener = document.removeEventListener.bind(document);
     var dispatchEvent = document.dispatchEvent.bind(document);
     var CustomEvent = window.CustomEvent;
 
@@ skipping 39 matching lines @@
       OPEN: {value: RealWebSocket.OPEN, enumerable: true},
       CLOSING: {value: RealWebSocket.CLOSING, enumerable: true},
       CLOSED: {value: RealWebSocket.CLOSED, enumerable: true},
       prototype: {value: RealWebSocket.prototype}
     });
 
     RealWebSocket.prototype.constructor = WebSocket;
   }, eventName);
 }
 
-function init(document)
+function init()
 {
   var shadow = null;
   var style = null;
   var observer = null;
   var tracer = null;
 
-  wrapWebSocket(document);
+  wrapWebSocket();
 
   function getPropertyFilters(callback)
   {
     ext.backgroundPage.sendMessage({
       type: "filters.get",
       what: "cssproperties"
     }, callback);
   }
   var propertyFilters = new CSSPropertyFilters(window, getPropertyFilters,
                                                addElemHideSelectors);
 
   // Use Shadow DOM if available to don't mess with web pages that rely on
   // the order of their own <style> tags (#309).
   //
   // However, creating a shadow root breaks running CSS transitions. So we
   // have to create the shadow root before transistions might start (#452).
   //
   // Also, using shadow DOM causes issues on some Google websites,
   // including Google Docs, Gmail and Blogger (#1770, #2602, #2687).
   if ("createShadowRoot" in document.documentElement &&
       !/\.(?:google|blogger)\.com$/.test(document.domain))
   {
     shadow = document.documentElement.createShadowRoot();
     shadow.appendChild(document.createElement("shadow"));
 
     // Stop the website from messing with our shadowRoot
     if ("shadowRoot" in Element.prototype)
     {
-      runInDocument(document, function()
+      runInDocument(function()
       {
         var ourShadowRoot = document.documentElement.shadowRoot;
         var desc = Object.getOwnPropertyDescriptor(Element.prototype, "shadowRoot");
         var shadowRoot = Function.prototype.call.bind(desc.get);
 
         Object.defineProperty(Element.prototype, "shadowRoot", {
           configurable: true, enumerable: true, get: function()
           {
             var shadow = shadowRoot(this);
             return shadow == ourShadowRoot ? null : shadow;
@@ skipping 71 matching lines @@
       tracer = null;
 
       if (style && style.parentElement)
         style.parentElement.removeChild(style);
       style = null;
 
       addElemHideSelectors(selectors.selectors);
       propertyFilters.apply();
 
       if (selectors.trace)
-        tracer = new ElementHidingTracer(document, selectors.selectors);
+        tracer = new ElementHidingTracer(selectors.selectors);
     };
 
     ext.backgroundPage.sendMessage({type: "get-selectors"}, function(response)
     {
       selectors = response;
       checkLoaded();
     });
 
     propertyFilters.load(function()
     {
       CSSPropertyFiltersLoaded = true;
       checkLoaded();
     });
   };
 
   updateStylesheet();
 
   document.addEventListener("error", function(event)
   {
     checkCollapse(event.target);
   }, true);
 
   document.addEventListener("load", function(event)
   {
     var element = event.target;
-
     if (/^i?frame$/.test(element.localName))
       checkCollapse(element);
-
-    if (/\bChrome\//.test(navigator.userAgent))
-    {
-      var contentDocument = getContentDocument(element);
-      if (contentDocument)
-      {
-        var contentWindow = contentDocument.defaultView;
-        if (contentDocument instanceof contentWindow.HTMLDocument)
-        {
-          // Prior to Chrome 37, content scripts cannot run in
-          // dynamically created frames. Also on Chrome 37-40
-          // document_start content scripts (like this one) don't
-          // run either in those frames due to https://crbug.com/416907.
-          // So we have to apply element hiding from the parent frame.
-          if (!("init" in contentWindow))
-            init(contentDocument);
-        }
-      }
-    }
   }, true);
 
   return updateStylesheet;
 }
 
 if (document instanceof HTMLDocument)
 {
   checkSitekey();
-  window.updateStylesheet = init(document);
+  window.updateStylesheet = init();
 }