Populate .current when navigator.serviceWorker is accessed

content/browser/service_worker/service_worker_dispatcher_host.h

Index: content/browser/service_worker/service_worker_dispatcher_host.h
diff --git a/content/browser/service_worker/service_worker_dispatcher_host.h b/content/browser/service_worker/service_worker_dispatcher_host.h
index 97b50bdc6f7066770209783a6292b0e85b005e84..b7a991bf6297d9f222c6690c7bf8f6e6a3636994 100644
--- a/content/browser/service_worker/service_worker_dispatcher_host.h
+++ b/content/browser/service_worker/service_worker_dispatcher_host.h
@@ -67,8 +67,6 @@ class CONTENT_EXPORT ServiceWorkerDispatcherHost : public BrowserMessageFilter {
                                  const GURL& pattern);
   void OnProviderCreated(int provider_id);
   void OnProviderDestroyed(int provider_id);
-  void OnAddScriptClient(int thread_id, int provider_id);
-  void OnRemoveScriptClient(int thread_id, int provider_id);
   void OnSetHostedVersionId(int provider_id, int64 version_id);
   void OnWorkerStarted(int thread_id,
                        int embedded_worker_id);
@@ -84,7 +82,8 @@ class CONTENT_EXPORT ServiceWorkerDispatcherHost : public BrowserMessageFilter {
   void OnPostMessage(int handle_id,
                      const base::string16& message,
                      const std::vector<int>& sent_message_port_ids);
-  void OnServiceWorkerObjectDestroyed(int handle_id);
+  void OnIncrementServiceWorkerRefCount(int handle_id);
+  void OnDecrementServiceWorkerRefCount(int handle_id);
 
   // Callbacks from ServiceWorkerContextCore
   void RegistrationComplete(int thread_id,