Standardize usage of virtual/override/final in content/browser/

content/browser/devtools/protocol/power_handler.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 CONTENT_BROWSER_DEVTOOLS_PROTOCOL_POWER_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_POWER_HANDLER_H_
 
 #include "content/browser/devtools/protocol/devtools_protocol_handler_impl.h"
 #include "content/browser/power_profiler/power_profiler_observer.h"
 
 namespace content {
 namespace devtools {
 namespace power {
 
 class PowerHandler : public PowerProfilerObserver {
  public:
   typedef DevToolsProtocolClient::Response Response;
 
   PowerHandler();
-  virtual ~PowerHandler();
+  ~PowerHandler() override;
 
   void SetClient(scoped_ptr<Client> client);
 
   // PowerProfilerObserver override.
-  virtual void OnPowerEvent(const PowerEventVector& events) override;
+  void OnPowerEvent(const PowerEventVector& events) override;
 
   void Detached();
 
   Response Start();
   Response End();
   Response CanProfilePower(bool* result);
   Response GetAccuracyLevel(std::string* result);
 
  private:
   scoped_ptr<Client> client_;
   bool enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerHandler);
 };
 
 }  // namespace power
 }  // namespace devtools
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_POWER_HANDLER_H_