Fix various grit python paths.

android_webview/tools/webview_repack_locales.py

 #!/usr/bin/env python
 # Copyright (c) 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 rename paks for a list of locales for the Android WebView.
 
 Gyp doesn't have any built-in looping capability, so this just provides a way to
 loop over a list of locales when renaming pak files. Based on
 chrome/tools/build/repack_locales.py
 """
 
 import optparse
 import os
 import shutil
 import sys
 
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..',
-                             'tools', 'grit'))
+# Prepend the grit module from the source tree so it takes precedence over other
+# grit versions that might present in the search path.
+sys.path.insert(1, os.path.join(os.path.dirname(__file__), '..', '..',
+                                'tools', 'grit'))
 from grit.format import data_pack
 
 def calc_output(locale):
   """Determine the file that will be generated for the given locale."""
   return os.path.join(PRODUCT_DIR, 'android_webview_assets',
                       'locales', locale + '.pak')
 
 def calc_inputs(locale):
   """Determine the files that need processing for the given locale."""
   inputs = []
@@ skipping 70 matching lines @@
 
   if print_outputs:
     return list_outputs(locales)
 
   return repack_locales(locales)
 
 if __name__ == '__main__':
   results = DoMain(sys.argv[1:])
   if results:
     print results