Report apptest_runner device not found infra failures.

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 1008 matching lines @@
     config.add_options_func(subparser)
 
   args = parser.parse_args()
 
   try:
     return RunTestsCommand(args, parser)
   except base_error.BaseError as e:
     logging.exception('Error occurred.')
     if e.is_infra_error:
       return constants.INFRA_EXIT_CODE
-    else:
-      return constants.ERROR_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())