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

content/renderer/android/renderer_date_time_picker.h

 // Copyright 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_RENDERER_ANDROID_RENDERER_DATE_TIME_PICKER_H_
 #define CONTENT_RENDERER_ANDROID_RENDERER_DATE_TIME_PICKER_H_
 
 #include "base/basictypes.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "third_party/WebKit/public/web/WebDateTimeChooserParams.h"
 
 struct ViewHostMsg_DateTimeDialogValue_Params;
 
 namespace blink {
 class WebDateTimeChooserCompletion;
 }  // namespace blink
 
 namespace content {
 class RenderViewImpl;
 
 class RendererDateTimePicker : public RenderViewObserver {
  public:
   RendererDateTimePicker(
       RenderViewImpl* sender,
       const blink::WebDateTimeChooserParams& params,
       blink::WebDateTimeChooserCompletion* completion);
-  virtual ~RendererDateTimePicker();
+  ~RendererDateTimePicker() override;
 
   bool Open();
 
  private:
   void OnReplaceDateTime(double value);
   void OnCancel();
 
   // RenderViewObserver
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   blink::WebDateTimeChooserParams chooser_params_;
   blink::WebDateTimeChooserCompletion* chooser_completion_;  // Not owned by us
 
   DISALLOW_COPY_AND_ASSIGN(RendererDateTimePicker);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ANDROID_RENDERER_DATE_TIME_PICKER_H_