Ensuring Google Update at user-level is installed alongside App Host, for the quick-enable App Host…

chrome/installer/util/google_update_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.
+
+#ifndef CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_UTIL_H_
+#define CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_UTIL_H_
+
+namespace google_update {
+
+// If user-level Google Update is absent, calls the system-level
+// GoogleUpdateSetup.exe to install it, and waits until it finishes.
+// Returns true if already installed or installed successfully.
+// Returns false if the installation fails.
+bool EnsureUserLevelGoogleUpdatePresent();
+
+// Tell Google Update that an uninstall has taken place.  This gives it a chance
+// to uninstall itself straight away if no more products are installed on the
+// system rather than waiting for the next time the scheduled task runs.
+// Returns true if this executes successfully.

[grt (UTC plus 2), 2012/09/24 15:23:39]

you can remove this line since the next one is clear enough.

[huangs, 2012/09/24 15:50:59]

Done.

+// Returns false if Google Update could not be executed, or times out.
+bool UninstallGoogleUpdate(bool system_install);
+
+}  // namespace google_update
+
+#endif  // CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_UTIL_H_