goma: back to build-provided client and disable oauth2

scripts/slave/recipe_modules/chromium_tests/api.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 collections
 import contextlib
 import copy
 import itertools
 import json
 
@@ skipping 184 matching lines @@
   def create_bot_db_from_master_dict(self, mastername, master_dict):
     bot_db = bdb_module.BotConfigAndTestDB()
     bot_db._add_master_dict_and_test_spec(mastername, master_dict, {})
     return bot_db
 
   def prepare_checkout(self, bot_config, root_solution_revision=None,
                        force=False):
     update_step = self.ensure_checkout(
         bot_config, root_solution_revision, force=force)
 
-    if (self.m.chromium.c.compile_py.compiler and
-        'goma' in self.m.chromium.c.compile_py.compiler):
-      self.m.chromium.ensure_goma()
-
     # TODO(robertocn): Remove this hack by the end of Q1/2016.
     if (bot_config.matches_any_bot_id(
             lambda bot_id: bot_id['mastername'] == 'tryserver.chromium.perf' and
                            bot_id['buildername'].endswith('builder'))
         and bot_config.get('bot_type') == 'builder'):
       if bot_config.should_force_legacy_compiling(self):
         self.m.chromium.c.project_generator.tool = 'gyp'
 
     self.set_up_swarming(bot_config)
     self.runhooks(update_step)
@@ skipping 597 matching lines @@
   def get_compile_targets_for_scripts(self):
     return self.m.python(
         name='get compile targets for scripts',
         script=self.m.path['checkout'].join(
             'testing', 'scripts', 'get_compile_targets.py'),
         args=[
             '--output', self.m.json.output(),
             '--',
         ] + self.get_common_args_for_scripts(),
         step_test_data=lambda: self.m.json.test_api.output({}))