Issue 4722 - Drop support for Chrome 41 - 48

lib/polyfills/fetch.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
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-(function(global)
-{
-  "use strict";
-
-  function Response(xhr)
-  {
-    this._xhr = xhr;
-  }
-  Response.prototype = {
-    get ok()
-    {
-      return this._xhr.status >= 200 && this._xhr.status <= 299;
-    },
-    text: function()
-    {
-      return Promise.resolve(this._xhr.responseText);
-    }
-  };
-
-  function fetch(url)
-  {
-    return new Promise(function(resolve, reject)
-    {
-      var xhr = new XMLHttpRequest();
-
-      xhr.onload = function()
-      {
-        resolve(new Response(xhr));
-      };
-
-      xhr.onerror = xhr.onabort = function()
-      {
-        reject(new TypeError("Failed to fetch"));
-      };
-
-      xhr.overrideMimeType("text/plain");
-      xhr.open("GET", url);
-      xhr.send();
-    });
-  }
-
-  // While the Fetch API is natively supported since Chrome 42, before
-  // Chrome 47 it failed to fetch files from within the extension bundle.
-  // https://code.google.com/p/chromium/issues/detail?id=466876
-  var builtinFetch = global.fetch;
-  if (builtinFetch)
-    global.fetch = function(url, init)
-    {
-      return builtinFetch(url, init).catch(function(reason)
-      {
-        if (new URL(url, document.URL).protocol == "chrome-extension:")
-          return fetch(url);
-        throw reason;
-      });
-    };
-  else
-    global.fetch = fetch;
-})(this);