don't always run LASTCHANGE

chrome/chrome_installer.gypi

 # 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': {
-    'lastchange_path': '<(SHARED_INTERMEDIATE_DIR)/build/LASTCHANGE',
+    'lastchange_path': '<(DEPTH)/build/util/LASTCHANGE',
     # 'branding_dir' is set in the 'conditions' section at the bottom.
   },
   'conditions': [
     ['OS=="win"', {
       'targets': [
         {
           'target_name': 'gcapi_dll',
           'type': 'loadable_module',
           'dependencies': [
             'installer_util',
@@ skipping 917 matching lines @@
       'variables': {
          'branding_dir': 'app/theme/google_chrome',
       },
     }, { # else branding!="Chrome"
       'variables': {
          'branding_dir': 'app/theme/chromium',
       },
     }],
   ],
 }