Fixed various issues in older Chrome versions

chrome/background.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2013 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 201 matching lines @@
     setBadge: function(badge)
     {
       if (!badge)
       {
         chrome.browserAction.setBadgeText({
           tabId: this._tabId,
           text: ""
         });
         return;
       }
-      
+
       if ("color" in badge)
       {
         chrome.browserAction.setBadgeBackgroundColor({
           tabId: this._tabId,
           color: badge.color
         });
       }
-  
+
       if ("number" in badge)
       {
         chrome.browserAction.setBadgeText({
           tabId: this._tabId,
           text: badge.number.toString()
         });
       }
     }
   };
 
@@ skipping 140 matching lines @@
           onclick(info.srcUrl, new Tab(tab));
         }
       });
     },
     removeAll: function(callback)
     {
       chrome.contextMenus.removeAll(callback);
     }
   };
 })();