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

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/views/printing.py

 # Copyright (C) 2010, 2012 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 396 matching lines @@
             for extension in ('.txt', '.png', '.wav'):
                 self._print_baseline(test_name, extension)
 
         self._print_default('  exp: %s' % exp_str)
         self._print_default('  got: %s' % got_str)
         self._print_default(' took: %-.3f' % result.test_run_time)
         self._print_default('')
 
     def _print_baseline(self, test_name, extension):
         baseline = self._port.expected_filename(test_name, extension)
-        if self._port._filesystem.exists(baseline):
+        if self._port.host.filesystem.exists(baseline):
             relpath = self._port.relative_test_filename(baseline)
         else:
             relpath = '<none>'
         self._print_default('  %s: %s' % (extension[1:], relpath))
 
     def _print_quiet(self, msg):
         self.writeln(msg)
 
     def _print_default(self, msg):
         if not self._options.quiet:
             self.writeln(msg)
 
     def _print_debug(self, msg):
         if self._options.debug_rwt_logging:
             self.writeln(msg)
 
     def write_throttled_update(self, msg):
         self._meter.write_throttled_update(msg)
 
     def write_update(self, msg):
         self._meter.write_update(msg)
 
     def writeln(self, msg):
         self._meter.writeln(msg)
 
     def flush(self):
         self._meter.flush()