Standardize usage of virtual/override/final specifiers.

ash/accelerators/nested_accelerator_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_ACCELERATORS_NESTED_ACCELERATOR_DELEGATE_H_
 #define ASH_ACCELERATORS_NESTED_ACCELERATOR_DELEGATE_H_
 
 #include "base/macros.h"
 #include "ui/wm/core/nested_accelerator_delegate.h"
 
 namespace ash {
 
 class NestedAcceleratorDelegate : public wm::NestedAcceleratorDelegate {
  public:
   NestedAcceleratorDelegate();
-  virtual ~NestedAcceleratorDelegate();
+  ~NestedAcceleratorDelegate() override;
 
   // wm::AcceleratorDispatcher::Delegate
-  virtual Result ProcessAccelerator(
-      const ui::Accelerator& accelerator) override;
+  Result ProcessAccelerator(const ui::Accelerator& accelerator) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NestedAcceleratorDelegate);
 };
 
 }  // namespace
 
 #endif  // ASH_ACCELERATORS_NESTED_ACCELERATOR_DELEGATE_H_