[web/request] clearly mark user_callback-related methods as deprecated
The deprecated decorator not only emits a warning at run-time
but above all makes the deprecation immediately apparent in the source.
closes #3567793.
if 'same_as' in schema:
sync_schema_props_perms('same_as', syncperms=False)
sync_schema_props_perms('Bookmark', syncperms=False)