Standardize usage of virtual/override/final in chrome/browser/devtools/

chrome/browser/devtools/device/self_device_provider.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 CHROME_BROWSER_DEVTOOLS_DEVICE_SELF_DEVICE_PROVIDER_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVICE_SELF_DEVICE_PROVIDER_H_
 
 #include "chrome/browser/devtools/device/android_device_manager.h"
 
 // Instantiate this class only in a test and/or when DEBUG_DEVTOOLS is defined.
 class SelfAsDeviceProvider : public AndroidDeviceManager::DeviceProvider {
  public:
   explicit SelfAsDeviceProvider(int port);
 
-  virtual void QueryDevices(const SerialsCallback& callback) override;
+  void QueryDevices(const SerialsCallback& callback) override;
 
-  virtual void QueryDeviceInfo(const std::string& serial,
-                               const DeviceInfoCallback& callback) override;
+  void QueryDeviceInfo(const std::string& serial,
+                       const DeviceInfoCallback& callback) override;
 
-  virtual void OpenSocket(const std::string& serial,
-                          const std::string& socket_name,
-                          const SocketCallback& callback) override;
+  void OpenSocket(const std::string& serial,
+                  const std::string& socket_name,
+                  const SocketCallback& callback) override;
 
  private:
-  virtual ~SelfAsDeviceProvider(){}
+  ~SelfAsDeviceProvider() override {}
 
   int port_;
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVICE_SELF_DEVICE_PROVIDER_H_