Standardize usage of virtual/override/final specifiers.

ash/test/test_overlay_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_OVERLAY_DELEGATE_H_
 #define ASH_TEST_TEST_OVERLAY_DELEGATE_H_
 
 #include "ash/wm/overlay_event_filter.h"
 
 namespace ash {
 namespace test {
 
 class TestOverlayDelegate : public OverlayEventFilter::Delegate {
  public:
   TestOverlayDelegate();
   virtual ~TestOverlayDelegate();
 
   int GetCancelCountAndReset();
 
  private:
   // Overridden from OverlayEventFilter::Delegate:
-  virtual void Cancel() override;
-  virtual bool IsCancelingKeyEvent(ui::KeyEvent* event) override;
-  virtual aura::Window* GetWindow() override;
+  void Cancel() override;
+  bool IsCancelingKeyEvent(ui::KeyEvent* event) override;
+  aura::Window* GetWindow() override;
 
   int cancel_count_;
 
   DISALLOW_COPY_AND_ASSIGN(TestOverlayDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_OVERLAY_DELEGATE_H_