Fix various grit python paths.

ios/chrome/tools/build/ios_repack_locales.py

 #!/usr/bin/env python
 # 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.
 
 """Helper script to repack paks for a list of locales for iOS.
 
 Gyp doesn't have any built-in looping capability, so this just provides a way to
 loop over a list of locales when repacking pak files, thus avoiding a
 proliferation of mostly duplicate, cut-n-paste gyp actions.
 """
 
 import optparse
 import os
 import sys
 
+# Prepend the grit module from the source tree so it takes precedence over other
+# grit versions that might present in the search path.
 script_dir = os.path.dirname(__file__)
 src_dir = os.path.join(script_dir, os.pardir, os.pardir, os.pardir, os.pardir)
-sys.path.append(os.path.join(src_dir, 'tools', 'grit'))
+sys.path.insert(1, os.path.join(src_dir, 'tools', 'grit'))
 
 from grit.format import data_pack
 
 
 def calc_output(options, locale):
   """Determine the file that will be generated for the given locale."""
   #e.g. '<(INTERMEDIATE_DIR)/repack/da.pak',
   # For Fake Bidi, generate it at a fixed path so that tests can safely
   # reference it.
   if locale == 'fake-bidi':
@@ skipping 130 matching lines @@
 
   if options.print_outputs:
     return quote_filenames(list_outputs(options, locales))
 
   return repack_locales(options, locales)
 
 if __name__ == '__main__':
   results = DoMain(sys.argv[1:])
   if results:
     print results