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

ash/system/user/user_card_view.cc

 // 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.
 
 #include "ash/system/user/user_card_view.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/session/session_state_delegate.h"
@@ skipping 56 matching lines @@
                        .ToImageSkia());
     AddChildView(icon);
     label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
     label_->SetFontList(ui::ResourceBundle::GetSharedInstance().GetFontList(
         ui::ResourceBundle::SmallFont));
     OnMediaCaptureChanged();
     Shell::GetInstance()->system_tray_notifier()->AddMediaCaptureObserver(this);
     set_id(VIEW_ID_USER_VIEW_MEDIA_INDICATOR);
   }
 
-  virtual ~MediaIndicator() {
+  ~MediaIndicator() override {
     Shell::GetInstance()->system_tray_notifier()->RemoveMediaCaptureObserver(
         this);
   }
 
   // MediaCaptureObserver:
-  virtual void OnMediaCaptureChanged() override {
+  void OnMediaCaptureChanged() override {
     Shell* shell = Shell::GetInstance();
     content::BrowserContext* context =
         shell->session_state_delegate()->GetBrowserContextByIndex(index_);
     MediaCaptureState state =
         Shell::GetInstance()->media_delegate()->GetMediaCaptureState(context);
     int res_id = 0;
     switch (state) {
       case MEDIA_CAPTURE_AUDIO_VIDEO:
         res_id = IDS_ASH_STATUS_TRAY_MEDIA_RECORDING_AUDIO_VIDEO;
         break;
@@ skipping 361 matching lines @@
     content::BrowserContext* context =
         delegate->GetBrowserContextByIndex(multiprofile_index);
     icon->SetImage(delegate->GetUserInfo(context)->GetImage(),
                    gfx::Size(kTrayAvatarSize, kTrayAvatarSize));
   }
   return icon;
 }
 
 }  // namespace tray
 }  // namespace ash