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

content/public/browser/android/content_protocol_handler.h

 // Copyright (c) 2014 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_PUBLIC_BROWSER_ANDROID_CONTENT_PROTOCOL_HANDLER_H_
 #define CONTENT_PUBLIC_BROWSER_ANDROID_CONTENT_PROTOCOL_HANDLER_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "net/url_request/url_request_job_factory.h"
 
 namespace base {
 class TaskRunner;
 }
 
 namespace content {
 
 // ProtocolHandler for content scheme jobs.
 class CONTENT_EXPORT ContentProtocolHandler :
     public net::URLRequestJobFactory::ProtocolHandler {
  public:
   // Creates and returns a ContentProtocolHandler instance.
   static ContentProtocolHandler* Create(
       const scoped_refptr<base::TaskRunner>& content_task_runner);
 
  protected:
-  virtual ~ContentProtocolHandler() {}
+  ~ContentProtocolHandler() override {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_ANDROID_CONTENT_PROTOCOL_HANDLER_H_