Remove use of wdiff from layout test runner.

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

 # Copyright (C) 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 346 matching lines @@
         if not usable_devices:
             raise test_run_results.TestRunException(test_run_results.NO_DEVICES_EXIT_STATUS,
                                                     "Unable to find any attached Android devices.")
         return len(usable_devices)
 
     def max_drivers_per_process(self):
         # Android falls over when we try to run multiple content_shells per worker.
         # See https://codereview.chromium.org/1158323009/
         return 1
 
-    def check_wdiff(self, more_logging=True):
-        return self._host_port.check_wdiff(more_logging)
-
     def check_build(self, needs_http, printer):
         exit_status = super(AndroidPort, self).check_build(needs_http, printer)
         if exit_status:
             return exit_status
 
         return self._check_devices(printer)
 
     def _check_devices(self, printer):
         # Printer objects aren't threadsafe, so we need to protect calls to them.
         lock = threading.Lock()
@@ skipping 112 matching lines @@
 
     def path_to_apache_config_file(self):
         return self._host_port.path_to_apache_config_file()
 
     def _path_to_driver(self, target=None):
         return self._build_path_with_target(target, self._driver_details.apk_name())
 
     def _path_to_image_diff(self):
         return self._host_port._path_to_image_diff()
 
-    def _path_to_wdiff(self):
-        return self._host_port._path_to_wdiff()
-
     def _shut_down_http_server(self, pid):
         return self._host_port._shut_down_http_server(pid)
 
     def _driver_class(self):
         return ChromiumAndroidDriver
 
     # Local private methods.
 
     @staticmethod
     def _android_server_process_constructor(port, server_name, cmd_line, env=None, more_logging=False):
@@ skipping 628 matching lines @@
         return command
 
     def _read_prompt(self, deadline):
         last_char = ''
         while True:
             current_char = self._server_process.read_stdout(deadline, 1)
             if current_char == ' ':
                 if last_char in ('#', '$'):
                     return
             last_char = current_char