ServiceWorker: Introduce ServiceWorkerMessageEvent to replace MessageEvent (2/3).

content/browser/service_worker/service_worker_version.cc

Index: content/browser/service_worker/service_worker_version.cc
diff --git a/content/browser/service_worker/service_worker_version.cc b/content/browser/service_worker/service_worker_version.cc
index 9504befa051be62a2107d6d13ce6525445130254..00b739f6128c32c4d95271614c97e1f03675aea0 100644
--- a/content/browser/service_worker/service_worker_version.cc
+++ b/content/browser/service_worker/service_worker_version.cc
@@ -1431,7 +1431,7 @@ void ServiceWorkerVersion::OnPostMessageToClient(
     // possibly due to timing issue or bad message.
     return;
   }
-  provider_host->PostMessage(message, sent_message_ports);
+  provider_host->PostMessage(this, message, sent_message_ports);
 }
 
 void ServiceWorkerVersion::OnFocusClient(int request_id,