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

chrome/browser/ui/webui/help/version_updater_win.cc

 // 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.
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "base/version.h"
 #include "base/win/win_util.h"
@@ skipping 18 matching lines @@
 
 // Windows implementation of version update functionality, used by the WebUI
 // About/Help page.
 class VersionUpdaterWin : public VersionUpdater {
  private:
   friend class VersionReader;
   friend class VersionUpdater;
 
   // Clients must use VersionUpdater::Create().
   VersionUpdaterWin();
-  virtual ~VersionUpdaterWin();
+  ~VersionUpdaterWin() override;
 
   // VersionUpdater implementation.
-  virtual void CheckForUpdate(const StatusCallback& callback) override;
-  virtual void RelaunchBrowser() const override;
+  void CheckForUpdate(const StatusCallback& callback) override;
+  void RelaunchBrowser() const override;
 
   // chrome::UpdateCheckCallback.
   void OnUpdateCheckResults(GoogleUpdateUpgradeResult result,
                             GoogleUpdateErrorCode error_code,
                             const base::string16& error_message,
                             const base::string16& version);
 
   // Update the UI to show the status of the upgrade.
   void UpdateStatus(GoogleUpdateUpgradeResult result,
                     GoogleUpdateErrorCode error_code,
@@ skipping 207 matching lines @@
   BeginUpdateCheck(task_runner, install_if_newer, GetElevationParent(),
                    base::Bind(&VersionUpdaterWin::OnUpdateCheckResults,
                               weak_factory_.GetWeakPtr()));
 }
 
 }  // namespace
 
 VersionUpdater* VersionUpdater::Create(content::BrowserContext* /* context */) {
   return new VersionUpdaterWin;
 }