Add support for Mac vs. Linux sky_server builds

sky/tools/download_sky_server

Index: sky/tools/download_sky_server
diff --git a/sky/tools/download_sky_server b/sky/tools/download_sky_server
deleted file mode 100755
index c3a95a1de7eeb5782ed88115a77df33935e827a6..0000000000000000000000000000000000000000
--- a/sky/tools/download_sky_server
+++ /dev/null
@@ -1,24 +0,0 @@
-#!/usr/bin/env python
-# Copyright (c) 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.
-
-import os
-import stat
-import subprocess
-
-from webkitpy.common.system import filesystem
-from webkitpy.common.webkit_finder import WebKitFinder
-
-finder = WebKitFinder(filesystem.FileSystem())
-
-output_file_ = finder.path_from_chromium_base('out', 'downloads', 'sky_server')
-subprocess.call([
-    'download_from_google_storage',
-    '--no_resume',
-    '--no_auth',
-    '--bucket', 'mojo',
-    '--sha1_file', finder.path_from_chromium_base('sky', 'tools', 'skygo', 'sky_server.sha1'),
-    '--output', output_file_
-])
-os.chmod(output_file_, os.stat(output_file_).st_mode | stat.S_IEXEC)