Don't generate LASTCHANGE at build time.

build/util/build_util.gyp

-# 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.
-
-{
-  'targets': [
-    {
-      'target_name': 'lastchange',
-      'type': 'none',
-      'variables': {
-        'lastchange_out_path': '<(DEPTH)/build/util/LASTCHANGE',
-        'default_lastchange_path': '../LASTCHANGE.in',
-      },
-      'actions': [
-        {
-          'action_name': 'lastchange',
-          'inputs': [
-            # Note:  <(default_lastchange_path) is optional,
-            # so it doesn't show up in inputs.
-            './lastchange.py',
-          ],
-          'outputs': [
-            '<(lastchange_out_path)',
-          ],
-          'action': [
-            'python', '<@(_inputs)',
-            '-o', '<(lastchange_out_path)',
-            '-d', '<(default_lastchange_path)',
-          ],
-          'message': 'Extracting last change to <(lastchange_out_path)',
-          'process_outputs_as_sources': '1',
-        },
-      ],
-    },
-  ]
-}