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

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

 # 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.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 184 matching lines @@
 
             dependency_interface.extended_attributes.update(target_interface.extended_attributes)
             assert target_interface == definitions.interfaces[dependency_interface.name]
             # A partial interface should use its original interface's
             # ImplementedAs. If the original interface doesn't have,
             # remove ImplementedAs defined in the partial interface.
             # Because partial interface needs the original interface's
             # cpp class to obtain partial interface's cpp class.
             # e.g.. V8WindowPartial.cpp:
             #   DOMWindow* impl = V8Window::toImpl(holder);
-            #   RawPtr<...> cppValue(DOMWindowQuota::webkitStorageInfo(impl));
+            #   DOMWindowQuota* cppValue(DOMWindowQuota::webkitStorageInfo(impl));
             # TODO(tasak): remove ImplementedAs extended attributes
             # from all partial interfaces. Instead, rename all cpp/header
             # files correctly. ImplementedAs should not be allowed in
             # partial interfaces.
             if 'ImplementedAs' not in target_interface.extended_attributes:
                 dependency_interface.extended_attributes.pop('ImplementedAs', None)
             dependency_interface.original_interface = target_interface
             target_interface.partial_interfaces.append(dependency_interface)
             resolved_definitions[dependency_component] = dependency_definitions
         else:
@@ skipping 121 matching lines @@
             # This loop may process the same interface many times, so it's
             # possible that we're adding the same attributes twice or more.
             # So check if there is a duplicate.
             for attr in inherited_unforgeable_attributes:
                 if attr not in interface.attributes:
                     interface.attributes.append(attr)
             referenced_interfaces.extend(interface_info.get('referenced_interfaces', []))
             interface_info['referenced_interfaces'] = sorted(set(referenced_interfaces))
             merge_dict_recursively(interface_info,
                                    {'cpp_includes': {component: cpp_includes}})