Revert of Simplify the initialization of Git objects in Host.

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 10 matching lines @@
 
 _log = logging.getLogger(__name__)
 
 MARKER_COMMENT = '# ====== New tests from w3c-test-autoroller added here ======'
 
 
 class WPTExpectationsUpdater(object):
 
     def __init__(self, host):
         self.host = host
+        self.host.initialize_scm()
         self.finder = WebKitFinder(self.host.filesystem)
 
     def run(self, args=None):
         """Downloads text new baselines and adds test expectations lines."""
         parser = argparse.ArgumentParser(description=__doc__)
         parser.add_argument('-v', '--verbose', action='store_true', help='More verbose logging.')
         args = parser.parse_args(args)
 
         log_level = logging.DEBUG if args.verbose else logging.INFO
         logging.basicConfig(level=log_level, format='%(message)s')
@@ skipping 335 matching lines @@
 
         Args:
             test_path: A file path relative to the layout tests directory.
                 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()