Delete all references to GIT_MODE=True from build

scripts/slave/recipe_modules/chromium/api.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.
 
 import re
 
 from recipe_engine import recipe_api
 from recipe_engine import util as recipe_util
 
 class TestLauncherFilterFileInputPlaceholder(recipe_util.InputPlaceholder):
@@ skipping 131 matching lines @@
     for c in bot_config.get('chromium_apply_config', []):
       self.apply_config(c)
 
     for c in additional_configs:
       self.apply_config(c)
 
     # Note that we have to call gclient.set_config() and apply_config() *after*
     # calling chromium.set_config(), above, because otherwise the chromium
     # call would reset the gclient config to its defaults.
     self.m.gclient.set_config(
-        'chromium', GIT_MODE=True,
+        'chromium',
         PATCH_PROJECT=self.m.properties.get('patch_project'))
     for c in bot_config.get('gclient_apply_config', []):
       self.m.gclient.apply_config(c)
 
     return (buildername, bot_config)
 
   def compile(self, targets=None, name=None, out_dir=None,
               target=None, **kwargs):
     """Return a compile.py invocation."""
     targets = targets or self.c.compile_py.default_targets.as_jsonish()
@@ skipping 632 matching lines @@
       }))
 
   def get_annotate_by_test_name(self, test_name):
     return 'graphing'
 
   def download_lto_plugin(self):
     return self.m.python(
         name='download LTO plugin',
         script=self.m.path['checkout'].join(
             'build', 'download_gold_plugin.py'))