Update {virtual,override,final} to follow C++11 style.

components/devtools_bridge/android/session_dependency_factory_android.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 COMPONENTS_DEVTOOLS_BRIDGE_ANDROID_SESSION_DEPENDENCY_FACTORY_ANDROID_H_
 #define COMPONENTS_DEVTOOLS_BRIDGE_ANDROID_SESSION_DEPENDENCY_FACTORY_ANDROID_H_
 
 #include "components/devtools_bridge/session_dependency_factory.h"
 #include "jni.h"
 
 namespace devtools_bridge {
 namespace android {
 
 class SessionDependencyFactoryAndroid : public SessionDependencyFactory {
  public:
   SessionDependencyFactoryAndroid();
-  virtual ~SessionDependencyFactoryAndroid();
+  ~SessionDependencyFactoryAndroid() override;
 
   static bool RegisterNatives(JNIEnv* env);
 
-  virtual scoped_ptr<AbstractPeerConnection> CreatePeerConnection(
+  scoped_ptr<AbstractPeerConnection> CreatePeerConnection(
       scoped_ptr<RTCConfiguration> config,
       scoped_ptr<AbstractPeerConnection::Delegate> delegate) override;
 
-  virtual scoped_refptr<base::TaskRunner> signaling_thread_task_runner()
-      override;
-  virtual scoped_refptr<base::TaskRunner> io_thread_task_runner() override;
+  scoped_refptr<base::TaskRunner> signaling_thread_task_runner() override;
+  scoped_refptr<base::TaskRunner> io_thread_task_runner() override;
 
  private:
   const scoped_ptr<SessionDependencyFactory> impl_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionDependencyFactoryAndroid);
 };
 
 }  // namespace android
 }  // namespace devtools_bridge
 
 #endif  // COMPONENTS_DEVTOOLS_BRIDGE_ANDROID_SESSION_DEPENDENCY_FACTORY_ANDROID_H_