Issue 338 - Updated minimum version to Chrome 28 and got rid of legacy compatibility code

chrome/ext/common.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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()
 {
   /* Message passing */
 
-  var sendMessage;
-  if ("runtime" in chrome && "sendMessage" in chrome.runtime)
-    sendMessage = chrome.runtime.sendMessage;
-  else if ("sendMessage" in chrome.extension)
-    sendMessage = chrome.extension.sendMessage;
-  else
-    sendMessage = chrome.extension.sendRequest;
-
-  ext._setupMessageListener = function(wrapSender)
-  {
-    var onMessage;
-    if ("runtime" in chrome && "onMessage" in chrome.runtime)
-      onMessage = chrome.runtime.onMessage;
-    else if ("onMessage" in chrome.extension)
-      onMessage = chrome.extension.onMessage;
-    else
-      onMessage = chrome.extension.onRequest;
-
-    onMessage.addListener(function(message, sender, sendResponse)
-    {
-      return ext.onMessage._dispatch(message, wrapSender(sender), sendResponse);
-    });
-  };
-
   ext.onMessage = new ext._EventTarget();
 
 
   /* Background page */
 
   ext.backgroundPage = {
-    sendMessage: sendMessage,
+    sendMessage: chrome.runtime.sendMessage,
     getWindow: function()
     {
       return chrome.extension.getBackgroundPage();
     }
   };
 
 
   /* Utils */
 
   ext.getURL = chrome.extension.getURL;
   ext.i18n = chrome.i18n;
 })();