Fix tweak_info_plist's TOP path to be found relative to itself rather than the includer's SRCROOT.

build/mac/tweak_info_plist.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 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.
 
 #
 # Xcode supports build variable substitutions and CPP; sadly, that doesn't work
 # because:
 #
@@ skipping 11 matching lines @@
 
 import optparse
 import os
 from os import environ as env
 import plistlib
 import re
 import subprocess
 import sys
 import tempfile
 
-TOP = os.path.join(env['SRCROOT'], '..')
+TOP = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
 
 
 def _GetOutput(args):
   """Runs a subprocess and waits for termination. Returns (stdout, returncode)
   of the process. stderr is attached to the parent."""
   proc = subprocess.Popen(args, stdout=subprocess.PIPE)
   (stdout, stderr) = proc.communicate()
   return (stdout, proc.returncode)
 
 
@@ skipping 228 matching lines @@
   # Info.plist will work perfectly well in any plist format, but traditionally
   # applications use xml1 for this, so convert it to ensure that it's valid.
   proc = subprocess.Popen(['plutil', '-convert', 'xml1', '-o', DEST_INFO_PLIST,
                            temp_info_plist.name])
   proc.wait()
   return proc.returncode
 
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv[1:]))