Removing chrome.pushMessaging API

chrome/browser/background/background_application_list_model.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_BACKGROUND_BACKGROUND_APPLICATION_LIST_MODEL_H_
 #define CHROME_BROWSER_BACKGROUND_BACKGROUND_APPLICATION_LIST_MODEL_H_
 
 #include <map>
 #include <string>
 
@@ skipping 126 matching lines @@
 
   // Invoked by Observe for NOTIFICATION_EXTENSION_PERMISSIONS_UPDATED.
   void OnExtensionPermissionsUpdated(
       const extensions::Extension* extension,
       extensions::UpdatedExtensionPermissionsInfo::Reason reason,
       const extensions::PermissionSet* permissions);
 
   // Refresh the list of background applications and generate notifications.
   void Update();
 
-  // Determines if the given extension has to be considered a "background app"
-  // due to its use of PushMessaging. Normally every extension that expectes
-  // push messages is classified as "background app", however there are some
-  // rare exceptions, so this function implements a whitelist.
-  static bool RequiresBackgroundModeForPushMessaging(
-      const extensions::Extension& extension);
-
   ApplicationMap applications_;
   extensions::ExtensionList extensions_;
   ObserverList<Observer, true> observers_;
   Profile* profile_;
   content::NotificationRegistrar registrar_;
   bool ready_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundApplicationListModel);
 };
 
 #endif  // CHROME_BROWSER_BACKGROUND_BACKGROUND_APPLICATION_LIST_MODEL_H_