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

android_webview/native/aw_settings.h

 // Copyright (c) 2013 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 ANDROID_WEBVIEW_NATIVE_AW_SETTINGS_H_
 #define ANDROID_WEBVIEW_NATIVE_AW_SETTINGS_H_
 
 #include <jni.h>
 
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/browser/web_contents_observer.h"
 
 namespace content{
 struct WebPreferences;
 }
 
 namespace android_webview {
 
 class AwRenderViewHostExt;
 
 class AwSettings : public content::WebContentsObserver {
  public:
   static AwSettings* FromWebContents(content::WebContents* web_contents);
 
   AwSettings(JNIEnv* env, jobject obj, content::WebContents* web_contents);
-  virtual ~AwSettings();
+  ~AwSettings() override;
 
   // Called from Java. Methods with "Locked" suffix require that the settings
   // access lock is held during their execution.
   void Destroy(JNIEnv* env, jobject obj);
   void PopulateWebPreferencesLocked(JNIEnv* env, jobject obj, jlong web_prefs);
   void ResetScrollAndScaleState(JNIEnv* env, jobject obj);
   void UpdateEverythingLocked(JNIEnv* env, jobject obj);
   void UpdateInitialPageScaleLocked(JNIEnv* env, jobject obj);
   void UpdateUserAgentLocked(JNIEnv* env, jobject obj);
   void UpdateWebkitPreferencesLocked(JNIEnv* env, jobject obj);
   void UpdateFormDataPreferencesLocked(JNIEnv* env, jobject obj);
   void UpdateRendererPreferencesLocked(JNIEnv* env, jobject obj);
 
   void PopulateWebPreferences(content::WebPreferences* web_prefs);
 
  private:
   AwRenderViewHostExt* GetAwRenderViewHostExt();
   void UpdateEverything();
 
   // WebContentsObserver overrides:
-  virtual void RenderViewCreated(
-      content::RenderViewHost* render_view_host) override;
-  virtual void WebContentsDestroyed() override;
+  void RenderViewCreated(content::RenderViewHost* render_view_host) override;
+  void WebContentsDestroyed() override;
 
   bool renderer_prefs_initialized_;
 
   JavaObjectWeakGlobalRef aw_settings_;
 };
 
 bool RegisterAwSettings(JNIEnv* env);
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_NATIVE_AW_SETTINGS_H_