In wpt-update-expectations, ignore tests that unexpectedly pass.

third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_expectations_updater.py

 # Copyright 2016 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.
 
 """Updates layout test expectations and baselines when updating w3c tests.
 
 Specifically, this class fetches results from try bots for the current CL, then
 (1) downloads new baseline files for any tests that can be rebaselined, and
 (2) updates the generic TestExpectations file for any other failing tests.
 """
@@ skipping 82 matching lines @@
                 }
             }
             If there are no failing results or no results could be fetched,
             this will return an empty dictionary.
         """
         layout_test_results = self.host.buildbot.fetch_results(build)
         if layout_test_results is None:
             _log.warning('No results for build %s', build)
             return {}
         port_name = self.host.builders.port_name_for_builder_name(build.builder_name)
-        test_results = layout_test_results.didnt_run_as_expected_results()
+        test_results = [result for result in layout_test_results.didnt_run_as_expected_results() if not result.did_pass()]
         failing_results_dict = self.generate_results_dict(port_name, test_results)
         return failing_results_dict
 
     def generate_results_dict(self, full_port_name, test_results):
         """Makes a dict with results for one platform.
 
         Args:
             full_port_name: The fully-qualified port name, e.g. "win-win10".
             test_results: A list of LayoutTestResult objects.
 
@@ skipping 324 matching lines @@
                 This might correspond to a deleted file or a non-test.
         """
         absolute_path = self.host.filesystem.join(self.finder.layout_tests_dir(), test_path)
         test_parser = TestParser(absolute_path, self.host)
         if not test_parser.test_doc:
             return False
         return test_parser.is_jstest()
 
     def _get_try_bots(self):
         return self.host.builders.all_try_builder_names()