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

content/browser/android/interstitial_page_delegate_android.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_INTERSTITIAL_PAGE_DELEGATE_ANDROID_H_
 #define CONTENT_BROWSER_ANDROID_INTERSTITIAL_PAGE_DELEGATE_ANDROID_H_
 
 #include <jni.h>
 #include <string>
 
 #include "base/android/jni_weak_ref.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/interstitial_page_delegate.h"
 
 namespace content {
 
 class InterstitialPage;
 class WebContents;
 
 // Native counterpart that allows interstitial pages to be constructed and
 // managed from Java.
 class InterstitialPageDelegateAndroid : public InterstitialPageDelegate {
  public:
   InterstitialPageDelegateAndroid(JNIEnv* env,
                                   jobject obj,
                                   const std::string& html_content);
-  virtual ~InterstitialPageDelegateAndroid();
+  ~InterstitialPageDelegateAndroid() override;
 
   void set_interstitial_page(InterstitialPage* page) { page_ = page; }
 
   // Methods called from Java.
   void Proceed(JNIEnv* env, jobject obj);
   void DontProceed(JNIEnv* env, jobject obj);
 
   // Implementation of InterstitialPageDelegate
-  virtual std::string GetHTMLContents() override;
-  virtual void OnProceed() override;
-  virtual void OnDontProceed() override;
-  virtual void CommandReceived(const std::string& command) override;
+  std::string GetHTMLContents() override;
+  void OnProceed() override;
+  void OnDontProceed() override;
+  void CommandReceived(const std::string& command) override;
 
   static bool RegisterInterstitialPageDelegateAndroid(JNIEnv* env);
 
  private:
   JavaObjectWeakGlobalRef weak_java_obj_;
 
   std::string html_content_;
   InterstitialPage* page_;  // Owns this.
 
   DISALLOW_COPY_AND_ASSIGN(InterstitialPageDelegateAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_INTERSTITIAL_PAGE_DELEGATE_ANDROID_H_