Remove #pragma once from content

content/public/test/mock_notification_observer.h

 // Copyright (c) 2011 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.
 
 #ifndef CONTENT_PUBLIC_TEST_MOCK_NOTIFICATION_OBSERVER_MOCK_H_
 #define CONTENT_PUBLIC_TEST_MOCK_NOTIFICATION_OBSERVER_MOCK_H_
-#pragma once
 
 #include "content/public/browser/notification_observer.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace content {
 
 class NotificationDetails;
 class NotificationSource;
 
 class MockNotificationObserver : public NotificationObserver {
  public:
   MockNotificationObserver();
   virtual ~MockNotificationObserver();
 
   MOCK_METHOD3(Observe, void(int type,
                              const NotificationSource& source,
                              const NotificationDetails& details));
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_MOCK_NOTIFICATION_OBSERVER_MOCK_H_