[Android] Don't use a device blacklist if one isn't provided.

build/android/test_runner.py

 #!/usr/bin/env python
 #
 # 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.
 
 """Runs all types of tests from one unified interface."""
 
 import argparse
 import collections
@@ skipping 877 matching lines @@
 
 def _GetAttachedDevices(blacklist_file, test_device):
   """Get all attached devices.
 
   Args:
     test_device: Name of a specific device to use.
 
   Returns:
     A list of attached devices.
   """
-  if not blacklist_file:
-    # TODO(jbudorick): Remove this once bots pass the blacklist file.
-    blacklist_file = device_blacklist.BLACKLIST_JSON
-    logging.warning('Using default device blacklist %s',
-                    device_blacklist.BLACKLIST_JSON)
+  blacklist = (device_blacklist.Blacklist(blacklist_file)
+               if blacklist_file
+               else None)
 
-  blacklist = device_blacklist.Blacklist(blacklist_file)
   attached_devices = device_utils.DeviceUtils.HealthyDevices(blacklist)
   if test_device:
     test_device = [d for d in attached_devices if d == test_device]
     if not test_device:
       raise device_errors.DeviceUnreachableError(
           'Did not find device %s among attached device. Attached devices: %s'
           % (test_device, ', '.join(attached_devices)))
     return test_device
 
   else:
@@ skipping 151 matching lines @@
     if e.is_infra_error:
       return constants.INFRA_EXIT_CODE
     return constants.ERROR_EXIT_CODE
   except: # pylint: disable=W0702
     logging.exception('Unrecognized error occurred.')
     return constants.ERROR_EXIT_CODE
 
 
 if __name__ == '__main__':
   sys.exit(main())