Provide a message to Google Update for the user when a system-level Chrome is already installed.

chrome/installer/util/prebuild/create_string_rc.py

 #!/usr/bin/env python
 # 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.
 
 """Generates .h and .rc files for installer strings. Run "python
 create_string_rc.py" for usage details.
 
 This script generates an rc file and header (NAME.{rc,h}) to be included in
 setup.exe. The rc file includes translations for strings pulled from the given
@@ skipping 53 matching lines @@
   'IDS_INSTALL_NO_PRODUCTS_TO_UPDATE',
   'IDS_INSTALL_MULTI_INSTALLATION_EXISTS',
   'IDS_SHORTCUT_TOOLTIP',
   'IDS_SHORTCUT_NEW_WINDOW',
   'IDS_APP_SHORTCUTS_SUBDIR_NAME',
   'IDS_APP_SHORTCUTS_SUBDIR_NAME_CANARY',
   'IDS_INBOUND_MDNS_RULE_NAME',
   'IDS_INBOUND_MDNS_RULE_NAME_CANARY',
   'IDS_INBOUND_MDNS_RULE_DESCRIPTION',
   'IDS_INBOUND_MDNS_RULE_DESCRIPTION_CANARY',
+  'IDS_INSTALL_EXISTING_VERSION_LAUNCHED',
 ]
 
 # The ID of the first resource string.
 FIRST_RESOURCE_ID = 1600
 
 
 class GrdHandler(sax.handler.ContentHandler):
   """Extracts selected strings from a .grd file.
 
   Attributes:
@@ skipping 334 matching lines @@
 
 
 def main():
   args = ParseCommandLine()
   StringRcMaker(args.name, args.inputs, args.outdir).MakeFiles()
   return 0
 
 
 if '__main__' == __name__:
   sys.exit(main())