Add OVERRIDE to content/.

content/test/test_notification_tracker.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_TEST_TEST_NOTIFICATION_TRACKER_H_
 #define CONTENT_TEST_TEST_NOTIFICATION_TRACKER_H_
 #pragma once
 
 #include <vector>
 
+#include "base/compiler_specific.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_source.h"
 
 // Provides an easy way for tests to verify that a given set of notifications
 // was received during test execution.
 class TestNotificationTracker : public content::NotificationObserver {
  public:
   // Records one received notification.
@@ skipping 41 matching lines @@
   // Returns the number of notifications received since the last reset.
   size_t size() const { return events_.size(); }
 
   // Returns the information about the event at the given index. The index must
   // be in [0, size).
   const Event& at(size_t i) const { return events_[i]; }
 
  protected:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
  private:
   content::NotificationRegistrar registrar_;
 
   // Lists all received since last cleared, in the order they were received.
   std::vector<Event> events_;
 
   DISALLOW_COPY_AND_ASSIGN(TestNotificationTracker);
 };
 
 #endif  // CONTENT_TEST_TEST_NOTIFICATION_TRACKER_H_