[Findit] Use PubSub built-in authentication for push endpoint.

appengine/findit/crash/test/crash_testcase.py

 # Copyright 2016 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 copy
 
 from google.appengine.api import users
 
 from common.findit_testcase import FinditTestCase
 from model.crash.crash_config import CrashConfig
 
 
 DEFAULT_CONFIG_DATA = {
     'fracas': {
-        'crash_data_push_token': 'secret_token',
         'analysis_result_pubsub_topic': 'projects/project-name/topics/name',
         'supported_platform_list_by_channel': {
             'canary': ['win', 'mac'],
             'supported_channel': ['supported_platform'],
         },
     }
 }
 
 class CrashTestCase(FinditTestCase):  # pragma: no cover.
 
   def setUp(self):
     super(CrashTestCase, self).setUp()
     CrashConfig.Get().Update(
         users.User(email='admin@chromium.org'), True, **DEFAULT_CONFIG_DATA)