ServiceWorker: Change the return value of ServiceWorkerRegistration::unregister to boolean (2/4)

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 42943e5ecf52f6c94fb66b362f9d6efeadaaeeb3..f940d06a48eabd2335a4da61eccb50f18f30ea70 100644
--- a/content/common/service_worker/service_worker_messages.h
+++ b/content/common/service_worker/service_worker_messages.h
@@ -197,13 +197,21 @@ IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_ServiceWorkerUnregistered,
                      int /* request_id */)
 
 // Sent when any kind of registration error occurs during a
-// RegisterServiceWorker / UnregisterServiceWorker handler above.
+// RegisterServiceWorker handler above.
 IPC_MESSAGE_CONTROL4(ServiceWorkerMsg_ServiceWorkerRegistrationError,
                      int /* thread_id */,
                      int /* request_id */,
                      blink::WebServiceWorkerError::ErrorType /* code */,
                      base::string16 /* message */)
 
+// Sent when any kind of registration error occurs during a
+// UnregisterServiceWorker handler above.
+IPC_MESSAGE_CONTROL4(ServiceWorkerMsg_ServiceWorkerUnregistrationError,
+                     int /* thread_id */,
+                     int /* request_id */,
+                     blink::WebServiceWorkerError::ErrorType /* code */,
+                     base::string16 /* message */)
+
 // Informs the child process that the ServiceWorker's state has changed.
 IPC_MESSAGE_CONTROL3(ServiceWorkerMsg_ServiceWorkerStateChanged,
                      int /* thread_id */,