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

content/common/service_worker/service_worker_messages.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Message definition file, included multiple times, hence no include guard.
 
 #include <string>
 #include <vector>
 
 #include "base/strings/string16.h"
@@ skipping 179 matching lines @@
                      int /* request_id */,
                      content::ServiceWorkerRegistrationObjectInfo,
                      content::ServiceWorkerVersionAttributes)
 
 // Response to ServiceWorkerMsg_UnregisterServiceWorker.
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_ServiceWorkerUnregistered,
                      int /* thread_id */,
                      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 */,
                      int /* handle_id */,
                      blink::WebServiceWorkerState)
 
 // Tells the child process to set service workers for the given provider.
 IPC_MESSAGE_CONTROL5(ServiceWorkerMsg_SetVersionAttributes,
                      int /* thread_id */,
                      int /* provider_id */,
@@ skipping 70 matching lines @@
                      blink::WebServiceWorkerCacheError /* reason */)
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_CacheStorageCreateError,
                      int /* request_id */,
                      blink::WebServiceWorkerCacheError /* reason */)
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_CacheStorageDeleteError,
                      int /* request_id */,
                      blink::WebServiceWorkerCacheError /* reason */)
 IPC_MESSAGE_CONTROL2(ServiceWorkerMsg_CacheStorageKeysError,
                      int /* request_id */,
                      blink::WebServiceWorkerCacheError /* reason */)