Have bindings layer assume and insist that all interface types are GCed.

third_party/WebKit/Source/bindings/scripts/compute_interfaces_info_overall.py

 #!/usr/bin/python
 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
@@ skipping 73 matching lines @@
 from collections import defaultdict
 import cPickle as pickle
 import optparse
 import sys
 
 from utilities import idl_filename_to_component, read_pickle_files, write_pickle_file, merge_dict_recursively
 
 INHERITED_EXTENDED_ATTRIBUTES = set([
     'ActiveScriptWrappable',
     'DependentLifetime',
-    'GarbageCollected',
 ])
 
 # Main variable (filled in and exported)
 interfaces_info = {}
 
 # Auxiliary variables (not visible to future build steps)
 partial_interface_files = defaultdict(lambda: {
     'full_paths': [],
     'include_paths': [],
 })
@@ skipping 72 matching lines @@
         if interface_info['ancestors']:
             ancestors[interface_name] = interface_info['ancestors']
         if interface_info['is_callback_interface']:
             callback_interfaces.add(interface_name)
         if interface_info['is_dictionary']:
             dictionaries[interface_name] = interface_info['is_dictionary']
         if interface_info['implemented_as']:
             implemented_as_interfaces[interface_name] = interface_info['implemented_as']
 
         inherited_extended_attributes = interface_info['inherited_extended_attributes']
-        if 'GarbageCollected' in inherited_extended_attributes:
-            garbage_collected_interfaces.add(interface_name)
+        garbage_collected_interfaces.add(interface_name)
 
     interfaces_info['ancestors'] = ancestors
     interfaces_info['callback_interfaces'] = callback_interfaces
     interfaces_info['dictionaries'] = dictionaries
     interfaces_info['implemented_as_interfaces'] = implemented_as_interfaces
     interfaces_info['garbage_collected_interfaces'] = garbage_collected_interfaces
     interfaces_info['component_dirs'] = component_dirs
 
 
 def compute_interfaces_info_overall(info_individuals):
@@ skipping 123 matching lines @@
     info_individuals = read_pickle_files(args)
 
     compute_interfaces_info_overall(info_individuals)
     write_pickle_file(interfaces_info_filename,
                       interfaces_info,
                       options.write_file_only_if_changed)
 
 
 if __name__ == '__main__':
     sys.exit(main())