Deflake PushMessagingBrowserTest.DenyPushPermissionUnregisters & friends

content/shell/browser/layout_test/layout_test_push_messaging_service.cc

 // 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.
 
 #include "content/shell/browser/layout_test/layout_test_push_messaging_service.h"
 
+#include "base/callback.h"
 #include "base/logging.h"
 
 namespace content {
 
 LayoutTestPushMessagingService::LayoutTestPushMessagingService() {
 }
 
 LayoutTestPushMessagingService::~LayoutTestPushMessagingService() {
 }
 
@@ skipping 49 matching lines @@
 
 void LayoutTestPushMessagingService::Unregister(
     const GURL& requesting_origin,
     int64 service_worker_registration_id,
     const std::string& sender_id,
     const UnregisterCallback& callback) {
   callback.Run(PUSH_UNREGISTRATION_STATUS_SUCCESS_UNREGISTERED);
 }
 
 }  // namespace content