Add terminateServiceWorker method for layout tests - chromium side

content/common/service_worker/service_worker_messages.h

Index: content/common/service_worker/service_worker_messages.h
diff --git a/content/common/service_worker/service_worker_messages.h b/content/common/service_worker/service_worker_messages.h
index f645c5699fba27014721c54c8f4141a737b0fe27..28f27eb9832e4dd603141cdcf41be7958032b36e 100644
--- a/content/common/service_worker/service_worker_messages.h
+++ b/content/common/service_worker/service_worker_messages.h
@@ -160,6 +160,11 @@ IPC_MESSAGE_CONTROL1(ServiceWorkerHostMsg_IncrementRegistrationRefCount,
 IPC_MESSAGE_CONTROL1(ServiceWorkerHostMsg_DecrementRegistrationRefCount,
                      int /* registration_handle_id */)
 
+// Tells the browser to terminate a service worker. Used in layout tests to
+// verify behavior when a service worker isn't running.
+IPC_MESSAGE_CONTROL1(ServiceWorkerHostMsg_TerminateWorker,
+                     int /* handle_id */)
+
 // Informs the browser that |provider_id| is associated
 // with a service worker script running context and
 // |version_id| identifies which ServiceWorkerVersion.