Make v8 recipes explicitly set GIT_MODE

scripts/slave/recipes/v8/auto_roll_deps.py

 # Copyright 2014 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.
 
 import base64
 
 DEPS = [
   'chromium',
   'depot_tools/bot_update',
   'depot_tools/gclient',
@@ skipping 45 matching lines @@
 
 def V8RevisionFrom(deps):
   Var = lambda var: '%s'  # pylint: disable=W0612
   exec(deps)
   return vars['v8_revision']
 
 def RunSteps(api):
   monitoring_state = 'failure'
   try:
     api.chromium.cleanup_temp()
-    api.gclient.set_config('chromium')
+    api.gclient.set_config('chromium', GIT_MODE=True)
     api.gclient.apply_config('v8_bleeding_edge_git')
 
     step_result = api.python(
         'check roll status',
         api.path['build'].join('scripts', 'tools', 'runit.py'),
         [api.path['build'].join('scripts', 'tools', 'pycurl.py'),
          'https://v8-roll.appspot.com/status'],
         stdout=api.raw_io.output(),
         step_test_data=lambda: api.raw_io.test_api.stream_output(
             '1', stream='stdout')
@@ skipping 130 matching lines @@
               '{"results": [{"subject": "Update V8 to foo",' +
               ' "issue": 123456, "commit": false}]}'))
     )
   yield (api.test('inconsistent_state') +
       api.properties.generic(mastername='client.v8') +
       api.override_step_data(
           'git cat-file', api.raw_io.stream_output(
               TEST_DEPS_FILE % 'beefdead'))
     )