Fix error message values in bb_device_steps.py after r229193 (Build fix).

TBR=peter@chromium.org
BUG=

Review URL: https://codereview.chromium.org/29653003

git-svn-id: http://src.chromium.org/svn/trunk/src/build@229472 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/buildbot/bb_device_steps.py

@@ -263,11 +263,11 @@ def RunWebkitLayoutTests(options):
 
   exit_code = RunCmd(['webkit/tools/layout_tests/run_webkit_tests.py'] +
                      cmd_args)
-  if exit_code == 254: # test_run_results.UNEXPECTED_ERROR_EXIT_STATUS
+  if exit_code == 255: # test_run_results.UNEXPECTED_ERROR_EXIT_STATUS
     bb_annotations.PrintMsg('?? (crashed or hung)')
-  elif exit_code == 253: # test_run_results.NO_DEVICES_EXIT_STATUS
+  elif exit_code == 254: # test_run_results.NO_DEVICES_EXIT_STATUS
     bb_annotations.PrintMsg('?? (no devices found)')
-  elif exit_code == 252: # test_run_results.NO_TESTS_EXIT_STATUS
+  elif exit_code == 253: # test_run_results.NO_TESTS_EXIT_STATUS
     bb_annotations.PrintMsg('?? (no tests found)')
   else:
     full_results_path = os.path.join('..', 'layout-test-results',