Prevent a service worker from keeping itself alive by self postMessage.

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 08c5698c48f1bccae2d712c24663c58f4fc37f75..ae1e55116f142889633be889b7ea02b60b343163 100644
--- a/content/browser/service_worker/service_worker_dispatcher_host.h
+++ b/content/browser/service_worker/service_worker_dispatcher_host.h
@@ -13,6 +13,7 @@
 #include "base/id_map.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/optional.h"
 #include "base/strings/string16.h"
 #include "content/browser/service_worker/service_worker_registration_status.h"
 #include "content/common/service_worker/service_worker.mojom.h"
@@ -188,6 +189,7 @@ class CONTENT_EXPORT ServiceWorkerDispatcherHost
       const base::string16& message,
       const url::Origin& source_origin,
       const std::vector<int>& sent_message_ports,
+      const base::Optional<base::TimeDelta>& timeout,
       const StatusCallback& callback,
       const SourceInfo& source_info);
   void DispatchExtendableMessageEventAfterStartWorker(
@@ -196,6 +198,7 @@ class CONTENT_EXPORT ServiceWorkerDispatcherHost
       const url::Origin& source_origin,
       const std::vector<int>& sent_message_ports,
       const ExtendableMessageEventSource& source,
+      const base::Optional<base::TimeDelta>& timeout,
       const StatusCallback& callback);
   template <typename SourceInfo>
   void DidFailToDispatchExtendableMessageEvent(