Remove a bunch of stuff in //mojo

mojo/test/test_utils_posix.cc

-// 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.
-
-#include "mojo/test/test_utils.h"
-
-#include "base/base_paths.h"
-#include "base/path_service.h"
-
-namespace mojo {
-namespace test {
-
-base::FilePath GetFilePathForJSResource(const std::string& path) {
-  std::string binding_path = "gen/" + path + ".js";
-  base::FilePath exe_dir;
-  PathService::Get(base::DIR_EXE, &exe_dir);
-  return exe_dir.AppendASCII(binding_path);
-}
-
-}  // namespace test
-}  // namespace mojo