Make all the rest of the recipes explicitly specify GIT_MODE

scripts/slave/recipes/emulator.py

 # Copyright 2015 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.
 
 from recipe_engine import recipe_api
 from recipe_engine.recipe_api import Property
 from recipe_engine.types import freeze
 
 DEPS = [
   'depot_tools/bot_update',
@@ skipping 44 matching lines @@
 
 def RunSteps(api, mastername, buildername):
   builder = BUILDERS[mastername][buildername]
   api.chromium_android.configure_from_properties(
       builder['config'],
       REPO_NAME='src',
       REPO_URL=REPO_URL,
       INTERNAL=False,
       BUILD_CONFIG=builder['target'])
 
-  api.gclient.set_config('chromium')
+  api.gclient.set_config('chromium', GIT_MODE=True)
   api.gclient.apply_config('android')
   api.emulator.set_config('base_config')
 
   api.bot_update.ensure_checkout()
   api.chromium_android.clean_local_files()
   api.chromium.runhooks()
 
   if api.chromium.c.project_generator.tool == 'mb':
     api.chromium.run_mb(mastername, buildername, use_goma=True)
 
@@ skipping 41 matching lines @@
               buildername=buildername,
               mastername=mastername))
 
   yield (
       api.test('Android_Tests__x86_emulator__test_fail') +
       api.properties.generic(
         buildername='Android Tests (x86 emulator)',
         mastername='chromium.fyi') +
       api.step_data('android_webview_unittests', retcode=2)
   )