Give SxS distribution its own registration GUIDs.

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 13 matching lines @@
 
 namespace base {
 class Version;
 }
 
 // This is a utility class that provides common installation related
 // utility methods that can be used by installer and also unit tested
 // independently.
 class InstallUtil {
  public:
+   static string16 GetAppUserModelId();

[grt (UTC plus 2), 2013/09/04 03:33:36]

de-indent one space and add a comment

[zturner, 2013/09/05 01:35:29]

Function is gone from latest patch.

+
   // Get the path to this distribution's Active Setup registry entries.
   // e.g. Software\Microsoft\Active Setup\Installed Components\<dist_guid>
   static string16 GetActiveSetupPath(BrowserDistribution* dist);
 
   // Attempts to trigger the command that would be run by Active Setup for a
   // system-level Chrome. For use only when system-level Chrome is installed.
   static void TriggerActiveSetupCommand();
 
   // Launches given exe as admin on Vista.
   static bool ExecuteExeAsAdmin(const CommandLine& cmd, DWORD* exit_code);
@@ skipping 158 matching lines @@
    private:
     DISALLOW_COPY_AND_ASSIGN(ProgramCompare);
   };  // class ProgramCompare
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstallUtil);
 };
 
 
 #endif  // CHROME_INSTALLER_UTIL_INSTALL_UTIL_H_