Delete all references to GIT_MODE=True from build

scripts/slave/recipes/ozone_ecs.py

 # Copyright 2013 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.types import freeze
 
 DEPS = [
   'depot_tools/bot_update',
   'chromium',
   'depot_tools/gclient',
@@ skipping 47 matching lines @@
 tests_that_do_not_pass = freeze([
 ])
 
 dbus_tests = freeze([
     'dbus_unittests',
 ])
 
 def RunSteps(api):
 
   api.chromium.set_config('chromium', BUILD_CONFIG='Debug')
-  api.gclient.set_config('chromium', BUILD_CONFIG='Debug', GIT_MODE=True)
+  api.gclient.set_config('chromium', BUILD_CONFIG='Debug')
 
   api.bot_update.ensure_checkout()
 
   api.chromium.c.gyp_env.GYP_DEFINES['embedded'] = 1
 
   api.chromium.runhooks()
   api.chromium.compile(['content_shell'], name='compile content_shell')
 
   try:
     api.python('check ecs deps', api.path['checkout'].join('tools',
@@ skipping 44 matching lines @@
                                slavename="test_slave")
   )
 
   yield (
     api.test('check_ecs_deps_fail') +
     api.properties.scheduled(mastername="chromium.fyi",
                             buildername='linux_ecs_ozone',
                             slavename="test_slave") +
     api.step_data('check ecs deps', retcode=1)
   )