Issue 1259 - Block while checking whether ABP is disabled on YouTube on Safari

safari/ext/content.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
@@ skipping 365 matching lines @@
 
       return obj;
     }
   };
 
   ext.backgroundPage = {
     sendMessage: function(message, responseCallback)
     {
       messageProxy.sendMessage(message, responseCallback, documentInfo);
     },
+    sendMessageSync: function(message)
+    {
+      return safari.self.tab.canLoad(
+        beforeLoadEvent,
+        {
+          category: "request",
+          pageId: documentInfo.pageId,
+          frameId: documentInfo.frameId,
+          payload: message
+        }
+      );
+    },
     getWindow: function()
     {
       return backgroundPageProxy.getObject(0);
     }
   };
 
 
   /* Message processing */
 
   var messageProxy = new ext._MessageProxy(safari.self.tab);
@@ skipping 16 matching lines @@
             messageProxy.handleResponse(event.message);
             break;
           case "proxyCallback":
             backgroundPageProxy.handleCallback(event.message);
             break;
         }
       }
     }
   });
 })();