Launch Google Update on uninstall.

chrome/installer/util/google_update_settings.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_SETTINGS_H_
 #define CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_SETTINGS_H_
 #pragma once
 
 #include <string>
 
@@ skipping 178 matching lines @@
   static bool WriteGoogleUpdateSystemClientKey(int handle,
                                                const std::wstring& key,
                                                const std::wstring& value);
 
   // Returns the effective update policy for |app_guid| as dictated by
   // Group Policy settings.  |is_overridden|, if non-NULL, is populated with
   // true if an app-specific policy override is in force, or false otherwise.
   static UpdatePolicy GetAppUpdatePolicy(const std::wstring& app_guid,
                                          bool* is_overridden);
 
+  // Returns Google Update's uninstall command line, or an empty string if none
+  // is found.
+  static string16 GetUninstallCommandLine(bool system_install);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(GoogleUpdateSettings);
 };
 
 #endif  // CHROME_INSTALLER_UTIL_GOOGLE_UPDATE_SETTINGS_H_