Move content/renderer/background_sync to Blink

third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextProxy.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 70 matching lines @@
                                               const WebNotificationData&,
                                               int actionIndex,
                                               const WebString& reply) = 0;
   virtual void dispatchNotificationCloseEvent(int eventID,
                                               const WebString& notificationID,
                                               const WebNotificationData&) = 0;
   virtual void dispatchPushEvent(int eventID, const WebString& data) = 0;
 
   virtual bool hasFetchEventHandler() = 0;
 
-  enum LastChanceOption { IsNotLastChance, IsLastChance };
-
-  // Once the ServiceWorker has finished handling the sync event,
-  // didHandleSyncEvent is called on the context client.
-  virtual void dispatchSyncEvent(int syncEventID,
-                                 const WebString& tag,
-                                 LastChanceOption) = 0;
-
   virtual void onNavigationPreloadResponse(
       int fetchEventID,
       std::unique_ptr<WebServiceWorkerResponse>,
       std::unique_ptr<WebDataConsumerHandle>) = 0;
   virtual void onNavigationPreloadError(
       int fetchEventID,
       std::unique_ptr<WebServiceWorkerError>) = 0;
 };
 
 }  // namespace blink
 
 #endif  // WebServiceWorkerContextProxy_h