move ConfigProvider ctxmgr back to su tests

test/test_api_usage.py

@@ -7,10 +7,10 @@ import time
 import re
 import json as py_json
 
-from contextlib import contextmanager
-from calendar import timegm
-from httmock import urlmatch, HTTMock, all_requests
 from StringIO import StringIO
+from calendar import timegm
+from contextlib import contextmanager
+from httmock import urlmatch, HTTMock, all_requests
 from urllib import urlencode
 from urlparse import urlparse, urlunparse, parse_qs
 
@@ -119,15 +119,6 @@ CSRF_TOKEN_KEY = '_csrf_token'
 CSRF_TOKEN = '123csrfforme'
 
 
-class ConfigForTesting(object):
-  def __enter__(self):
-    config_provider.reset_for_test()
-    return config_provider
-
-  def __exit__(self, type, value, traceback):
-    config_provider.reset_for_test()
-
-
 class ApiTestCase(unittest.TestCase):
   maxDiff = None