Standardize usage of virtual/override/final specifiers in device/.

device/vibration/vibration_manager_impl_default.cc

 // 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.
 
 #include "device/vibration/vibration_manager_impl.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 
 namespace device {
 
 namespace {
 
 class VibrationManagerEmptyImpl : public mojo::InterfaceImpl<VibrationManager> {
  public:
   static VibrationManagerEmptyImpl* Create() {
     return new VibrationManagerEmptyImpl();
   }
 
   void Vibrate(int64 milliseconds) override {}
   void Cancel() override {}
 
  private:
   VibrationManagerEmptyImpl() {}
-  virtual ~VibrationManagerEmptyImpl() {}
+  ~VibrationManagerEmptyImpl() override {}
 };
 
 }  // namespace
 
 //static
 void VibrationManagerImpl::Create(
     mojo::InterfaceRequest<VibrationManager> request) {
   BindToRequest(VibrationManagerEmptyImpl::Create(), &request);
 }
 
 }  // namespace device