Add chrome, installer_util targets to GN build.

chrome/chrome.gyp

 # 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.
 {
   'variables': {
     'chromium_code': 1,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
     # the link of the actual chrome (or chromium) executable on
@@ skipping 462 matching lines @@
             'app/chrome_exe.ver',
             'app/chrome_dll.ver',
             'app/nacl64_exe.ver',
             'app/other.ver',
           ],
           'includes': [
             'version_resource_rules.gypi',
           ],
         },
         {
+          # GN version: //chrome:version_header
           'target_name': 'chrome_version_header',
           'type': 'none',
           'hard_dependency': 1,
           'actions': [
             {
               'action_name': 'version_header',
               'variables': {
                 'lastchange_path':
                   '<(DEPTH)/build/util/LASTCHANGE',
               },
@@ skipping 277 matching lines @@
               'sources': [
                 'service/cloud_print/print_system_dummy.cc',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }