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

chrome/browser/android/provider/chrome_browser_provider.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 CHROME_BROWSER_ANDROID_PROVIDER_CHROME_BROWSER_PROVIDER_H_
 #define CHROME_BROWSER_ANDROID_PROVIDER_CHROME_BROWSER_PROVIDER_H_
 
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 154 matching lines @@
   base::android::ScopedJavaLocalRef<jbyteArray> GetFaviconOrTouchIcon(
       JNIEnv* env,
       jobject obj,
       jstring url);
 
   base::android::ScopedJavaLocalRef<jbyteArray> GetThumbnail(JNIEnv* env,
                                                              jobject obj,
                                                              jstring url);
 
  private:
-  virtual ~ChromeBrowserProvider();
+  ~ChromeBrowserProvider() override;
 
   // Override bookmarks::BaseBookmarkModelObserver.
-  virtual void BookmarkModelChanged() override;
-  virtual void ExtensiveBookmarkChangesBeginning(
+  void BookmarkModelChanged() override;
+  void ExtensiveBookmarkChangesBeginning(
       bookmarks::BookmarkModel* model) override;
-  virtual void ExtensiveBookmarkChangesEnded(
-      bookmarks::BookmarkModel* model) override;
+  void ExtensiveBookmarkChangesEnded(bookmarks::BookmarkModel* model) override;
 
   // Deals with updates to the history service.
   void OnHistoryChanged();
 
   // Override history::HistoryServiceObserver.
   void OnURLVisited(HistoryService* history_service,
                     ui::PageTransition transition,
                     const history::URLRow& row,
                     const history::RedirectList& redirects,
                     base::Time visit_time) override;
@@ skipping 27 matching lines @@
 
   ScopedObserver<HistoryService, HistoryServiceObserver>
       history_service_observer_;
 
   bool handling_extensive_changes_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserProvider);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_PROVIDER_CHROME_BROWSER_PROVIDER_H_