Remove mojom_fetcher.

mojo/public/tools/mojom_fetcher/pylib/fetcher/mojom_directory.py

-# Copyright 2015 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import os
-
-from fetcher.dependency import group_target_name
-
-class MojomDirectory(object):
-  """This class represents a directory that directly holds mojom files, in the
-  external directory structure."""
-  def __init__(self, path):
-    self.path = path
-    self.mojoms = []
-
-  def add_mojom(self, mojom):
-    self.mojoms.append(mojom)
-
-  def get_jinja_parameters(self, include_dirs):
-    """Get the Jinja parameters to construct the BUILD.gn file of this
-    directory."""
-    params = {}
-    params["group_name"] = group_target_name(self.path)
-    params["mojoms"] = []
-    for mojom in self.mojoms:
-      params["mojoms"].append(mojom.get_jinja_parameters(include_dirs))
-    return params
-
-  def get_build_gn_path(self):
-    return os.path.join(self.path, "BUILD.gn")