Fix the new First Run sentinel file path determination.

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 88 matching lines @@
   // Returns true if the installation represented by the pair of |dist| and
   // |system_level| is a multi install.
   static bool IsMultiInstall(BrowserDistribution* dist, bool system_install);
 
   // Returns true if this is running setup process for Chrome SxS (as
   // indicated by the presence of --chrome-sxs on the command line) or if this
   // is running Chrome process from the Chrome SxS installation (as indicated
   // by either --chrome-sxs or the executable path).
   static bool IsChromeSxSProcess();
 
+  // Returns true if the sentinel file exists (or the path cannot be obtained).
+  static bool IsFirstRunSentinelPresent();
+
   // Populates |path| with the path to |file| in the sentinel directory for
   // |dist|. Returns false on error.
   static bool GetSentinelFilePath(const base::FilePath::CharType* file,
                                   BrowserDistribution* dist,
                                   base::FilePath* path);
 
   // Deletes the registry key at path key_path under the key given by root_key.
   static bool DeleteRegistryKey(HKEY root_key, const base::string16& key_path);
 
   // Deletes the registry value named value_name at path key_path under the key
@@ skipping 82 matching lines @@
    private:
     DISALLOW_COPY_AND_ASSIGN(ProgramCompare);
   };  // class ProgramCompare
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstallUtil);
 };
 
 
 #endif  // CHROME_INSTALLER_UTIL_INSTALL_UTIL_H_