Remove a bunch of stuff in //mojo

mojo/util/filename_util.h

-// Copyright 2014 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.
-
-#ifndef MOJO_UTIL_FILENAME_UTIL_H_
-#define MOJO_UTIL_FILENAME_UTIL_H_
-
-class GURL;
-
-namespace base {
-class FilePath;
-}
-
-namespace mojo {
-namespace util {
-
-// Given the full path to a file name, creates a file: URL. The returned URL
-// may not be valid if the input is malformed.
-GURL FilePathToFileURL(const base::FilePath& path);
-
-// This URL is going to be treated as a directory. Ensure there is a trailing
-// slash so that GURL.Resolve(...) works correctly.
-GURL AddTrailingSlashIfNeeded(const GURL& url);
-
-// Converts a file url to a path
-base::FilePath UrlToFilePath(const GURL& url);
-
-}  // namespace util
-}  // namespace mojo
-
-#endif  // MOJO_UTIL_FILENAME_UTIL_H_