lastchange: add a flag to only print the svn revision number

chrome/chrome_installer.gypi

 # Copyright (c) 2011 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',
     # 'branding_dir' is set in the 'conditions' section at the bottom.
   },
   'conditions': [
@@ skipping 322 matching lines @@
             'installer/setup/setup_util_unittest.cc',
           ],
         },
       ],
     }],
     ['OS=="linux" and branding=="Chrome"', {
       'variables': {
         # Always google_chrome since this only applies to branding==Chrome.
         'branding_dir': 'app/theme/google_chrome',
         'version' : '<!(python <(version_py_path) -f <(DEPTH)/chrome/VERSION -t "@MAJOR@.@MINOR@.@BUILD@.@PATCH@")',
-        'revision' : '<!(python <(DEPTH)/build/util/lastchange.py | cut -d "=" -f 2)',
+        'revision' : '<!(python <(DEPTH)/build/util/lastchange.py --revision-only)',
         'packaging_files_common': [
           'installer/linux/internal/common/apt.include',
           'installer/linux/internal/common/default-app.template',
           'installer/linux/internal/common/default-app-block.template',
           'installer/linux/internal/common/desktop.template',
           'installer/linux/internal/common/google-chrome/google-chrome.info',
           'installer/linux/internal/common/installer.include',
           'installer/linux/internal/common/postinst.include',
           'installer/linux/internal/common/prerm.include',
           'installer/linux/internal/common/repo.cron',
@@ skipping 529 matching lines @@
       },
     }],
   ],
 }
 
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