ServiceWorker: Support SWRegistration.unregister() in SWGlobalScope [2/2]

public/web/WebServiceWorkerContextClient.h

Index: public/web/WebServiceWorkerContextClient.h
diff --git a/public/web/WebServiceWorkerContextClient.h b/public/web/WebServiceWorkerContextClient.h
index 3118298353c941e36cefc1a0c056dbef52a4bd25..c72b3e16265125fc0bdf2bb1c1d12400158fba80 100644
--- a/public/web/WebServiceWorkerContextClient.h
+++ b/public/web/WebServiceWorkerContextClient.h
@@ -47,6 +47,7 @@ class WebDataSource;
 class WebServiceWorkerCacheStorage;
 class WebServiceWorkerContextProxy;
 class WebServiceWorkerNetworkProvider;
+class WebServiceWorkerProvider;
 class WebServiceWorkerResponse;
 class WebString;
 
@@ -148,6 +149,9 @@ public:
     // Ownership of the returned object is transferred to the caller.
     virtual WebServiceWorkerNetworkProvider* createServiceWorkerNetworkProvider(WebDataSource*) { return 0; }
 
+    // Ownership of the returned object is transferred to the caller.
+    virtual WebServiceWorkerProvider* createServiceWorkerProvider() { return 0; }
+
     // Ownership of the passed callbacks is transferred to the callee, callee
     // should delete the callbacks after calling either onSuccess or onError.
     // WebServiceWorkerClientsInfo and WebServiceWorkerError ownerships are