Move content/renderer/background_sync to Blink

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

Index: third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextProxy.h
diff --git a/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextProxy.h b/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextProxy.h
index 50aec0e83bf61f4d268d12c0657b3dc5020f4a61..75b3db8de98b728df188014f78851ed40a4a846e 100644
--- a/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextProxy.h
+++ b/third_party/WebKit/public/web/modules/serviceworker/WebServiceWorkerContextProxy.h
@@ -88,14 +88,6 @@ class WebServiceWorkerContextProxy {
 
   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>,