Delete several unused GYP scripts from build/mac and chrome/tools/build/mac.

chrome/tools/build/mac/clean_up_old_versions

Index: chrome/tools/build/mac/clean_up_old_versions
diff --git a/chrome/tools/build/mac/clean_up_old_versions b/chrome/tools/build/mac/clean_up_old_versions
deleted file mode 100755
index b5c6e5fce98cfa46216d2002780ce7903b4fa96a..0000000000000000000000000000000000000000
--- a/chrome/tools/build/mac/clean_up_old_versions
+++ /dev/null
@@ -1,26 +0,0 @@
-#!/bin/sh
-
-# Copyright (c) 2009 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.
-
-# Remove old versioned directories from an .app bundle.  The built-up bundle
-# only needs to contain the current versioned directory.
-
-set -e
-
-if [ $# -ne 1 ] ; then
-  echo "usage: ${0} VERSION" >& 2
-  exit 1
-fi
-
-VERSION="${1}"
-CONTENTS_DIR="${BUILT_PRODUCTS_DIR}/${CONTENTS_FOLDER_PATH}"
-VERSIONED_DIR="${CONTENTS_DIR}/Versions"
-CURRENT_VERSIONED_DIR="${VERSIONED_DIR}/${VERSION}"
-
-for dir in "${VERSIONED_DIR}/"* ; do
-  if [ "${dir}" != "${CURRENT_VERSIONED_DIR}" ] ; then
-    rm -rf "${dir}"
-  fi
-done