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

chrome/browser/android/most_visited_sites.h

 // Copyright 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 CHROME_BROWSER_ANDROID_MOST_VISITED_SITES_H_
 #define CHROME_BROWSER_ANDROID_MOST_VISITED_SITES_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 27 matching lines @@
                                   jobject j_observer,
                                   jint num_sites);
   void GetURLThumbnail(JNIEnv* env,
                        jobject obj,
                        jstring url,
                        jobject j_callback);
   void BlacklistUrl(JNIEnv* env, jobject obj, jstring j_url);
   void RecordOpenedMostVisitedItem(JNIEnv* env, jobject obj, jint index);
 
   // ProfileSyncServiceObserver implementation.
-  virtual void OnStateChanged() override;
+  void OnStateChanged() override;
 
   // Registers JNI methods.
   static bool Register(JNIEnv* env);
 
  private:
   // The source of the Most Visited sites.
   enum MostVisitedSource {
     TOP_SITES,
     SUGGESTIONS_SERVICE
   };
 
-  virtual ~MostVisitedSites();
+  ~MostVisitedSites() override;
   void QueryMostVisitedURLs();
 
   // Initialize the query to Top Sites. Called if the SuggestionsService is not
   // enabled, or if it returns no data.
   void InitiateTopSitesQuery();
 
   // Callback for when data is available from TopSites.
   void OnMostVisitedURLsAvailable(
       base::android::ScopedJavaGlobalRef<jobject>* j_observer,
       int num_sites,
@@ skipping 60 matching lines @@
 
   MostVisitedSource mv_source_;
 
   // For callbacks may be run after destruction.
   base::WeakPtrFactory<MostVisitedSites> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MostVisitedSites);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_MOST_VISITED_SITES_H_