Follow-up fix to change in Git module (r465813)

third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/git.py

 # Copyright (c) 2009, 2010, 2011 Google Inc. All rights reserved.
 # Copyright (c) 2009 Apple Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 85 matching lines @@
             input=stdin,
             return_exit_code=return_exit_code,
             decode_output=decode_output)
 
     def absolute_path(self, repository_relative_path):
         """Converts repository-relative paths to absolute paths."""
         return self._filesystem.join(self.checkout_root, repository_relative_path)
 
     def in_working_directory(self, path):
         try:
-            self._executive.run_command(
+            return self._executive.run_command(
                 [self._executable_name, 'rev-parse', '--is-inside-work-tree'],
                 cwd=path, error_handler=Executive.ignore_error).rstrip() == 'true'
         except OSError:
             # The Windows bots seem to throw a WindowsError when git isn't installed.
             # TODO(qyearsley): Check if this is still necessary and remove if possible.
             _log.warn('Got OSError when running Git.in_working_directory.')
             return False
 
     def find_checkout_root(self, path):
         # "git rev-parse --show-cdup" would be another way to get to the root
@@ skipping 273 matching lines @@
         match = re.search(r"^\s*(?P<branch_name>\S+)\s+merges with remote master$", origin_info, re.MULTILINE)
         if not match:
             raise ScriptError(message='Unable to find local branch tracking origin/master.')
         branch = str(match.group('branch_name'))
         return self._branch_from_ref(self.run(['rev-parse', '--symbolic-full-name', branch]).strip())
 
     def ensure_cleanly_tracking_remote_master(self):
         self._discard_working_directory_changes()
         self.run(['checkout', '-q', self._branch_tracking_remote_master()])
         self._discard_local_commits()