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

chrome/installer/util/chrome_browser_sxs_operations.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_INSTALLER_UTIL_CHROME_BROWSER_SXS_OPERATIONS_H_
 #define CHROME_INSTALLER_UTIL_CHROME_BROWSER_SXS_OPERATIONS_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/installer/util/chrome_browser_operations.h"
 
 namespace installer {
 
 // Operations specific to Chrome SxS; see ProductOperations for general info.
 class ChromeBrowserSxSOperations : public ChromeBrowserOperations {
  public:
   ChromeBrowserSxSOperations() {}
 
-  virtual void AppendProductFlags(const std::set<base::string16>& options,
-                                  base::CommandLine* cmd_line) const override;
+  void AppendProductFlags(const std::set<base::string16>& options,
+                          base::CommandLine* cmd_line) const override;
 
-  virtual void AppendRenameFlags(const std::set<base::string16>& options,
-                                 base::CommandLine* cmd_line) const override;
+  void AppendRenameFlags(const std::set<base::string16>& options,
+                         base::CommandLine* cmd_line) const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserSxSOperations);
 };
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_CHROME_BROWSER_SXS_OPERATIONS_H_