Implement the ServiceWorker "activate" event during activation

content/browser/service_worker/embedded_worker_registry.h

Index: content/browser/service_worker/embedded_worker_registry.h
diff --git a/content/browser/service_worker/embedded_worker_registry.h b/content/browser/service_worker/embedded_worker_registry.h
index 6645b7b46abf5387f17b3fb056daf5e796574751..eb2e97d77bb686e409360c8f9d0e744fb6f42cab 100644
--- a/content/browser/service_worker/embedded_worker_registry.h
+++ b/content/browser/service_worker/embedded_worker_registry.h
@@ -54,6 +54,8 @@ class CONTENT_EXPORT EmbeddedWorkerRegistry
   // ServiceWorkerDispatcherHost.
   void OnWorkerStarted(int process_id, int thread_id, int embedded_worker_id);
   void OnWorkerStopped(int process_id, int embedded_worker_id);
+  // FIXME(dominicc): Rename this. The name leads to confusion that
+  // this sends a message to the browser itself.
   void OnSendMessageToBrowser(int embedded_worker_id,
                               int request_id,
                               const IPC::Message& message);