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

chrome/utility/importer/ie_importer_win.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_UTILITY_IMPORTER_IE_IMPORTER_WIN_H_
 #define CHROME_UTILITY_IMPORTER_IE_IMPORTER_WIN_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/strings/string16.h"
 #include "chrome/utility/importer/importer.h"
 #include "components/favicon_base/favicon_usage_data.h"
 
 struct ImportedBookmarkEntry;
 
 class IEImporter : public Importer {
  public:
   IEImporter();
 
   // Importer:
-  virtual void StartImport(const importer::SourceProfile& source_profile,
-                           uint16 items,
-                           ImporterBridge* bridge) override;
+  void StartImport(const importer::SourceProfile& source_profile,
+                   uint16 items,
+                   ImporterBridge* bridge) override;
 
  private:
   typedef std::vector<ImportedBookmarkEntry> BookmarkVector;
 
   // A struct that hosts the information of IE Favorite folder.
   struct FavoritesInfo {
     base::FilePath path;
     base::string16 links_folder;
   };
 
@@ skipping 39 matching lines @@
   int CurrentIEVersion() const;
 
   // IE does not have source path. It's used in unit tests only for providing a
   // fake source.
   base::FilePath source_path_;
 
   DISALLOW_COPY_AND_ASSIGN(IEImporter);
 };
 
 #endif  // CHROME_UTILITY_IMPORTER_IE_IMPORTER_WIN_H_