Clean up the way we determine which env vars to pass to content_shell.

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 238 matching lines @@
             return True
         return False
 
     def start(self, pixel_tests, per_test_args):
         new_cmd_line = self.cmd_line(pixel_tests, per_test_args)
         if not self._server_process or new_cmd_line != self._current_cmd_line:
             self._start(pixel_tests, per_test_args)
             self._run_post_start_tasks()
 
     def _setup_environ_for_driver(self, environment):
-        environment['DYLD_LIBRARY_PATH'] = self._port._build_path()
-        environment['DYLD_FRAMEWORK_PATH'] = self._port._build_path()
-        environment['LOCAL_RESOURCE_ROOT'] = self._port.layout_tests_dir()
-        if 'WEBKITOUTPUTDIR' in os.environ:
-            environment['WEBKITOUTPUTDIR'] = os.environ['WEBKITOUTPUTDIR']
         if self._profiler:
             environment = self._profiler.adjusted_environment(environment)
         return environment
 
     def _start(self, pixel_tests, per_test_args):
         self.stop()
         self._driver_tempdir = self._port._filesystem.mkdtemp(prefix='%s-' % self._port.driver_name())
         server_name = self._port.driver_name()
         environment = self._port.setup_environ_for_server(server_name)
         environment = self._setup_environ_for_driver(environment)
@@ skipping 187 matching lines @@
         self.content = str()  # FIXME: Should be bytearray() once we require Python 2.6.
         self.decoded_content = None
         self.malloc = None
         self.js_heap = 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