Make [TypeChecking=Interface] the default

third_party/WebKit/Source/bindings/scripts/v8_attributes.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 324 matching lines @@
         context['cpp_setter'] = '%sCreateDataProperty(propertyName, v8Value, info)' % cpp_name(interface)
         return
 
     extended_attributes = attribute.extended_attributes
     idl_type = attribute.idl_type
 
     # [RaisesException], [RaisesException=Setter]
     is_setter_raises_exception = (
         'RaisesException' in extended_attributes and
         extended_attributes['RaisesException'] in [None, 'Setter'])
-    # [TypeChecking=Interface] / [LegacyInterfaceTypeChecking]
+    # [LegacyInterfaceTypeChecking]
     has_type_checking_interface = (
         not is_legacy_interface_type_checking(interface, attribute) and
         idl_type.is_wrapper_type)
 
     context.update({
         'has_setter_exception_state':
             is_setter_raises_exception or has_type_checking_interface or
             idl_type.v8_conversion_needs_exception_state,
         'has_type_checking_interface': has_type_checking_interface,
         'is_setter_call_with_execution_context': has_extended_attribute_value(
@@ skipping 152 matching lines @@
     return attribute.idl_type.name.endswith('Constructor')
 
 
 def update_constructor_attribute_context(interface, attribute, context):
     context['needs_constructor_getter_callback'] = context['measure_as'] or context['deprecate_as']
     # When the attribute name is the same as the interface name, do not generate
     # callback functions for each attribute and use
     # {{cpp_class}}ConstructorAttributeSetterCallback.  Otherwise, generate
     # a callback function in order to hard-code the attribute name.
     context['needs_constructor_setter_callback'] = context['name'] != context['constructor_type']