Update checks of multi-installs now use the proper app guid....

chrome/installer/util/helper.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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 contains helper functions used by setup.
 
 #ifndef CHROME_INSTALLER_UTIL_HELPER_H_
 #define CHROME_INSTALLER_UTIL_HELPER_H_
 #pragma once
 
+#include <string>
+
 class BrowserDistribution;
 class CommandLine;
 class FilePath;
 
 namespace installer {
 
 // Checks if a distribution is currently installed as part of a multi-install.
 bool IsInstalledAsMulti(bool system_install, BrowserDistribution* dist);
 
 // Retrieves the command line switches for uninstalling the distribution.
@@ skipping 23 matching lines @@
 // 2) The same folder as Chrome is installed into.
 // Right now this function will only return Chrome's installation folder
 // if Chrome Frame is not already installed or if Chrome Frame is installed
 // in multi_install mode.
 // If multi_install is false or if CF is installed in single mode, then the
 // returned path will be the "Chrome Frame" subfolder of either the user or
 // system default installation folders.
 FilePath GetChromeFrameInstallPath(bool multi_install, bool system_install,
                                    BrowserDistribution* dist);
 
+// Returns the app guid under which the current process receives updates from
+// Google Update.
+std::wstring GetAppGuidForUpdates(bool system_install);
+
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_HELPER_H_