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

chrome/installer/util/install_util.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.
 //
 // This file declares utility functions for the installer. The original reason
 // for putting these functions in installer\util library is so that we can
 // separate out the critical logic and write unit tests for it.
 
 #ifndef CHROME_INSTALLER_UTIL_INSTALL_UTIL_H_
 #define CHROME_INSTALLER_UTIL_INSTALL_UTIL_H_
@@ skipping 147 matching lines @@
       const wchar_t* key_path,
       REGSAM wow64_access,
       const wchar_t* value_name,
       const RegistryValuePredicate& predicate);
 
   // A predicate that performs a case-sensitive string comparison.
   class ValueEquals : public RegistryValuePredicate {
    public:
     explicit ValueEquals(const base::string16& value_to_match)
         : value_to_match_(value_to_match) { }
-    virtual bool Evaluate(const base::string16& value) const override;
+    bool Evaluate(const base::string16& value) const override;
    protected:
     base::string16 value_to_match_;
    private:
     DISALLOW_COPY_AND_ASSIGN(ValueEquals);
   };
 
   // Returns zero on install success, or an InstallStatus value otherwise.
   static int GetInstallReturnCode(installer::InstallStatus install_status);
 
   // Composes |program| and |arguments| into |command_line|.
   static void ComposeCommandLine(const base::string16& program,
                                  const base::string16& arguments,
                                  base::CommandLine* command_line);
 
   // Returns a string in the form YYYYMMDD of the current date.
   static base::string16 GetCurrentDate();
 
   // A predicate that compares the program portion of a command line with a
   // given file path.  First, the file paths are compared directly.  If they do
   // not match, the filesystem is consulted to determine if the paths reference
   // the same file.
   class ProgramCompare : public RegistryValuePredicate {
    public:
     explicit ProgramCompare(const base::FilePath& path_to_match);
-    virtual ~ProgramCompare();
-    virtual bool Evaluate(const base::string16& value) const override;
+    ~ProgramCompare() override;
+    bool Evaluate(const base::string16& value) const override;
     bool EvaluatePath(const base::FilePath& path) const;
 
    protected:
     static bool OpenForInfo(const base::FilePath& path, base::File* file);
     static bool GetInfo(const base::File& file,
                         BY_HANDLE_FILE_INFORMATION* info);
 
     base::FilePath path_to_match_;
     base::File file_;
     BY_HANDLE_FILE_INFORMATION file_info_;
 
    private:
     DISALLOW_COPY_AND_ASSIGN(ProgramCompare);
   };  // class ProgramCompare
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstallUtil);
 };
 
 
 #endif  // CHROME_INSTALLER_UTIL_INSTALL_UTIL_H_