Fix bot_update api rename.

scripts/slave/recipes/swarming/staging.py

 # Copyright 2014 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.
 
 """Swarming staging recipe: runs tests for HEAD of chromium using HEAD of
 swarming_client toolset on Swarming staging server instances
 (*-dev.appspot.com).
 
 Intended to catch bugs in swarming_client and Swarming servers early on, before
 full roll out.
@@ skipping 162 matching lines @@
       if not api.properties.get('platform') == 'android':
         # TODO(estaab): Move this into the swarming recipe_module behind a flag
         # after testing on staging.
         step_result = api.step.active_result
         gtest_results = getattr(step_result.test_utils, 'gtest_results', None)
         if gtest_results and gtest_results.raw:
           # This is a potentially large json file (on the order of 10s of MiB)
           # but swarming/api.py is already parsing it to get failed shards so we
           # reuse it here.
           parsed_gtest_data = gtest_results.raw
-          chrome_revision_cp = api.bot_update.properties.get(
+          chrome_revision_cp = api.bot_update.last_returned_properties.get(
               'got_revision_cp', 'x@{#0}')
           chrome_revision = str(api.commit_position.parse_revision(
               chrome_revision_cp))
           api.test_results.upload(
               api.json.input(parsed_gtest_data),
               chrome_revision=chrome_revision,
               test_type=task.title,
               test_results_server='test-results-test.appspot.com')
 
 
@@ skipping 26 matching lines @@
     api.test('android') +
     api.platform.name('linux') +
     api.properties.scheduled() +
     api.properties(configuration='Release', platform='android') +
     api.override_step_data(
         'isolate tests',
         api.isolate.output_json(targets=[
             'dummy_target_1', 'dummy_target_2', 'chrome_public_test_apk'])
     )
   )