Fix many* python scripts in src/

remoting/webapp/build-webapp.py

-#!/usr/bin/python
+#!/usr/bin/env python
 # Copyright (c) 2011 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.
 
 """Creates a directory with with the unpacked contents of the remoting webapp.
 
 The directory will contain a copy-of or a link-to to all remoting webapp
 resources.  This includes HTML/JS and any plugin binaries. The script also
 massages resulting files appropriately with host plugin data. Finally,
 a zip archive for all of the above is produced.
@@ skipping 164 matching lines @@
 
   # Make the zipfile.
   createZip(zip_path, destination)
 
 
 def main():
   if len(sys.argv) < 6:
     print ('Usage: build-webapp.py '
            '<build-type> <mime-type> <dst> <zip-path> <plugin> '
            '<other files...> --locales <locales...>')
-    sys.exit(1)
+    return 1
 
   reading_locales = False
   files = []
   locales = []
   for arg in sys.argv[6:]:
     if arg == "--locales":
       reading_locales = True;
     elif reading_locales:
       locales.append(arg)
     else:
       files.append(arg)
 
   buildWebApp(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4], sys.argv[5],
               files, locales)
+  return 0
 
 
 if __name__ == '__main__':
-  main()
+  sys.exit(main())