replace 'virtual ... OVERRIDE' with '... override'

base/timer/mock_timer.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.
 
 #ifndef BASE_TIMER_MOCK_TIMER_H_
 #define BASE_TIMER_MOCK_TIMER_H_
 
 #include "base/timer/timer.h"
 
 namespace base {
 
 class BASE_EXPORT MockTimer : public Timer {
  public:
   MockTimer(bool retain_user_task, bool is_repeating);
   MockTimer(const tracked_objects::Location& posted_from,
             TimeDelta delay,
             const base::Closure& user_task,
             bool is_repeating);
   virtual ~MockTimer();
 
   // base::Timer implementation.
-  virtual bool IsRunning() const OVERRIDE;
-  virtual base::TimeDelta GetCurrentDelay() const OVERRIDE;
-  virtual void Start(const tracked_objects::Location& posted_from,
-                     base::TimeDelta delay,
-                     const base::Closure& user_task) OVERRIDE;
-  virtual void Stop() OVERRIDE;
-  virtual void Reset() OVERRIDE;
+  bool IsRunning() const override;
+  base::TimeDelta GetCurrentDelay() const override;
+  void Start(const tracked_objects::Location& posted_from,
+             base::TimeDelta delay,
+             const base::Closure& user_task) override;
+  void Stop() override;
+  void Reset() override;
 
   // Testing methods.
   void Fire();
 
  private:
   base::Closure user_task_;
   TimeDelta delay_;
   bool is_running_;
 };
 
 }  // namespace base
 
 #endif  // !BASE_TIMER_MOCK_TIMER_H_