Get test_webkitpy to actually run again.

sky/tools/webkitpy/common/system/filesystem_mock.py

 # Copyright (C) 2009 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 78 matching lines @@
     def expanduser(self, path):
         if path[0] != "~":
             return path
         parts = path.split(self.sep, 1)
         home_directory = self.sep + "Users" + self.sep + "mock"
         if len(parts) == 1:
             return home_directory
         return home_directory + self.sep + parts[1]
 
     def path_to_module(self, module_name):
-        return "/mock-checkout/third_party/WebKit/Tools/Scripts/" + module_name.replace('.', '/') + ".py"
+        return "/mock-checkout/third_party/WebKit/tools/" + module_name.replace('.', '/') + ".py"
 
     def chdir(self, path):
         path = self.normpath(path)
         if not self.isdir(path):
             raise OSError(errno.ENOENT, path, os.strerror(errno.ENOENT))
         self.cwd = path
 
     def copyfile(self, source, destination):
         if not self.exists(source):
             self._raise_not_found(source)
@@ skipping 370 matching lines @@
         return self.data.readline(length)
 
     def __iter__(self):
         return self.data.__iter__()
 
     def next(self):
         return self.data.next()
 
     def seek(self, offset, whence=os.SEEK_SET):
         self.data.seek(offset, whence)