[toward-py3k] remove import with_statement (part of #2711624) They are unneeded since we dropped python 2.5 compatibility. This will help Python 3.3 experimentation.

if 'same_as' in schema:
    sync_schema_props_perms('same_as', syncperms=False)
sync_schema_props_perms('Bookmark', syncperms=False)