Replace assert_promise_rejects with upstream promise_rejects.

third_party/WebKit/LayoutTests/PRESUBMIT.py

 # Copyright (c) 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.
 
 """LayoutTests/ presubmit script for Blink.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
@@ skipping 26 matching lines @@
 
     groups = [[
         'imported/web-platform-tests/resources/testharness.js',
         'resources/testharness.js',
     ], [
         'imported/web-platform-tests/resources/testharnessreport.js',
         'resources/testharnessreport.js',
     ], [
         'imported/web-platform-tests/resources/idlharness.js',
         'resources/idlharness.js',
-    ], [
-        'resources/testharness-helpers.js',
-        'http/tests/resources/testharness-helpers.js',
     ]]
 
     def _absolute_path(s):
         return input_api.os_path.join(input_api.PresubmitLocalPath(), *s.split('/'))
 
     def _local_path(s):
         return input_api.os_path.join('third_party', 'WebKit', 'LayoutTests', *s.split('/'))
 
     errors = []
     for group in groups:
@@ skipping 12 matching lines @@
     results.extend(_CheckTestharnessResults(input_api, output_api))
     results.extend(_CheckIdenticalFiles(input_api, output_api))
     return results
 
 
 def CheckChangeOnCommit(input_api, output_api):
     results = []
     results.extend(_CheckTestharnessResults(input_api, output_api))
     results.extend(_CheckIdenticalFiles(input_api, output_api))
     return results