Issue 3853 - Use new messaging API for the first-run page

lib/child/cssProperties.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 23 matching lines @@
           let message = {payload, frames: getFrames(senderWindow)};
           if (typeof callback == "function")
             port.emitWithResponse("ext_message", message).then(callback);
           else
             port.emit("ext_message", message);
         }
       }
     }
   };
 
-  function loadScript(script)
-  {
-    Services.scriptloader.loadSubScript(script, scope);
-  }
-
   function addUserCSS(window, cssCode)
   {
     let uri = Services.io.newURI("data:text/css," + encodeURIComponent(cssCode),
         null, null);
     let utils = window.QueryInterface(Ci.nsIInterfaceRequestor)
                       .getInterface(Ci.nsIDOMWindowUtils);
     utils.loadSheet(uri, Ci.nsIDOMWindowUtils.USER_SHEET);
   }
 
   function initCSSPropertyFilters()
   {
-    loadScript("chrome://adblockplus/content/cssProperties.js");
+    Services.scriptloader.loadSubScript(
+        "chrome://adblockplus/content/cssProperties.js", scope);
 
     let onContentWindow = (subject, topic, data) =>
     {
       if (!(subject instanceof Ci.nsIDOMWindow))
         return;
 
       let onReady = event =>
       {
         subject.removeEventListener("DOMContentLoaded", onReady);
         let handler = new scope.CSSPropertyFilters(subject, selectors =>
@@ skipping 21 matching lines @@
         false);
     onShutdown.add(() =>
     {
       Services.obs.removeObserver(onContentWindow,
           "content-document-global-created");
     });
   }
 
   initCSSPropertyFilters();
 })();