Don't access Port._filesystem directly (use Port.host.filesystem instead).

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/driver.py

 # Copyright (C) 2011 Google 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
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 292 matching lines @@
             self._start(pixel_tests, per_test_args)
             self._run_post_start_tasks()
 
     def _setup_environ_for_driver(self, environment):
         if self._profiler:
             environment = self._profiler.adjusted_environment(environment)
         return environment
 
     def _start(self, pixel_tests, per_test_args, wait_for_ready=True):
         self.stop()
-        self._driver_tempdir = self._port._filesystem.mkdtemp(prefix='%s-' % self._port.driver_name())
+        self._driver_tempdir = self._port.host.filesystem.mkdtemp(prefix='%s-' % self._port.driver_name())
         server_name = self._port.driver_name()
         environment = self._port.setup_environ_for_server()
         environment = self._setup_environ_for_driver(environment)
         self._crashed_process_name = None
         self._crashed_pid = None
         self._leaked = False
         self._leak_log = None
         cmd_line = self.cmd_line(pixel_tests, per_test_args)
         self._server_process = self._port._server_process_constructor(
             self._port, server_name, cmd_line, environment, more_logging=self._port.get_option("driver_logging"))
@@ skipping 28 matching lines @@
         return self._server_process.pid()
 
     def stop(self, timeout_secs=0.0):
         if self._server_process:
             self._server_process.stop(timeout_secs)
             self._server_process = None
             if self._profiler:
                 self._profiler.profile_after_exit()
 
         if self._driver_tempdir:
-            self._port._filesystem.rmtree(str(self._driver_tempdir))
+            self._port.host.filesystem.rmtree(str(self._driver_tempdir))
             self._driver_tempdir = None
 
         self._current_cmd_line = None
 
     def cmd_line(self, pixel_tests, per_test_args):
         cmd = self._command_wrapper(self._port.get_option('wrapper'))
         cmd.append(self._port._path_to_driver())
         if self._no_timeout:
             cmd.append('--no-timeout')
         cmd.extend(self._port.get_option('additional_driver_flag', []))
@@ skipping 171 matching lines @@
         self.decoded_content = None
         self.malloc = None
         self.js_heap = None
         self.stdin_path = None
 
     def decode_content(self):
         if self.encoding == 'base64' and self.content is not None:
             self.decoded_content = base64.b64decode(self.content)
         else:
             self.decoded_content = self.content