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

content/browser/android/content_settings.h

 // Copyright (c) 2012 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_ANDROID_CONTENT_SETTINGS_H_
 #define CONTENT_BROWSER_ANDROID_CONTENT_SETTINGS_H_
 
 #include <jni.h>
 
 #include "base/android/jni_weak_ref.h"
 #include "content/public/browser/web_contents_observer.h"
 
 namespace content {
 
 class ContentSettings : public WebContentsObserver {
  public:
   ContentSettings(JNIEnv* env, jobject obj,
                   WebContents* contents);
 
   static bool RegisterContentSettings(JNIEnv* env);
 
   bool GetJavaScriptEnabled(JNIEnv* env, jobject obj);
 
  private:
   // Self-deletes when the underlying WebContents is destroyed.
-  virtual ~ContentSettings();
+  ~ContentSettings() override;
 
   // WebContentsObserver overrides:
-  virtual void WebContentsDestroyed() override;
+  void WebContentsDestroyed() override;
 
   // The Java counterpart to this class.
   JavaObjectWeakGlobalRef content_settings_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_CONTENT_SETTINGS_H_