Standardize usage of virtual/override/final specifiers.

ash/test/test_volume_control_delegate.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 ASH_TEST_TEST_VOLUME_CONTROL_DELEGATE_H_
 #define ASH_TEST_TEST_VOLUME_CONTROL_DELEGATE_H_
 
 #include "ash/volume_control_delegate.h"
 #include "ui/base/accelerators/accelerator.h"
 
 namespace ash {
 
 // A simple test double for a VolumeControlDelegate
 // Will count the number of times the HandleVolumeMute, HandleVolumeDown and
 // HandleVolumeUp methods are invoked.
 class TestVolumeControlDelegate : public ash::VolumeControlDelegate {
  public:
   explicit TestVolumeControlDelegate(bool consume);
-  virtual ~TestVolumeControlDelegate();
+  ~TestVolumeControlDelegate() override;
 
   int handle_volume_mute_count() const {
     return handle_volume_mute_count_;
   }
 
   int handle_volume_down_count() const {
     return handle_volume_down_count_;
   }
 
   int handle_volume_up_count() const {
     return handle_volume_up_count_;
   }
 
   const ui::Accelerator& last_accelerator() const {
     return last_accelerator_;
   }
 
   // ash::VolumeControlDelegate:
-  virtual bool HandleVolumeMute(const ui::Accelerator& accelerator) override;
-  virtual bool HandleVolumeDown(const ui::Accelerator& accelerator) override;
-  virtual bool HandleVolumeUp(const ui::Accelerator& accelerator) override;
+  bool HandleVolumeMute(const ui::Accelerator& accelerator) override;
+  bool HandleVolumeDown(const ui::Accelerator& accelerator) override;
+  bool HandleVolumeUp(const ui::Accelerator& accelerator) override;
 
  private:
   // Keeps track of the return value that should be used for the methods
   // inherited from VolumeControlDelegate
   bool consume_;
   int handle_volume_mute_count_;
   int handle_volume_down_count_;
   int handle_volume_up_count_;
   ui::Accelerator last_accelerator_;
 
   DISALLOW_COPY_AND_ASSIGN(TestVolumeControlDelegate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_VOLUME_CONTROL_DELEGATE_H_