Update installed ServiceWorkers.

content/browser/service_worker/service_worker_context_core.h

Index: content/browser/service_worker/service_worker_context_core.h
diff --git a/content/browser/service_worker/service_worker_context_core.h b/content/browser/service_worker/service_worker_context_core.h
index 2243d5f9a27237d07158ec50763b23d2cd9186c5..6fc156581cd276230316210919f5733ec014063c 100644
--- a/content/browser/service_worker/service_worker_context_core.h
+++ b/content/browser/service_worker/service_worker_context_core.h
@@ -131,7 +131,6 @@ class CONTENT_EXPORT ServiceWorkerContextCore
   void RemoveAllProviderHostsForProcess(int process_id);
   scoped_ptr<ProviderHostIterator> GetProviderHostIterator();
 
-  // The callback will be called on the IO thread.
   // A child process of |source_process_id| may be used to run the created
   // worker for initial installation.
   // Non-null |provider_host| must be given if this is called from a document,
@@ -141,10 +140,9 @@ class CONTENT_EXPORT ServiceWorkerContextCore
                              int source_process_id,
                              ServiceWorkerProviderHost* provider_host,
                              const RegistrationCallback& callback);
-
-  // The callback will be called on the IO thread.
   void UnregisterServiceWorker(const GURL& pattern,
                                const UnregistrationCallback& callback);
+  void UpdateServiceWorker(ServiceWorkerRegistration* registration);
 
   // This class maintains collections of live instances, this class
   // does not own these object or influence their lifetime.