bindings: Moves custom getters/setters to the prototype chain.

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 501 matching lines @@
     if 'DoNotExposeJSAccessors' in attribute.extended_attributes:
         return False
 
     # These attributes must not be accessors on prototype chains.
     if (is_constructor_attribute(attribute) or
             attribute.is_static or
             is_unforgeable(interface, attribute) or
             'OverrideBuiltins' in interface.extended_attributes):
         return False
 
-    # FIXME: We should move all of the following DOM attributes to prototype
-    # chains.
-    if (has_custom_getter(attribute) or
-            has_custom_setter(attribute) or
-            interface.name == 'Window'):
+    # The members of Window interface must be placed on the instance object.
+    if interface.name == 'Window':
         return False
 
     return is_accessor
 
 
 ################################################################################
 # Constructors
 ################################################################################
 
 idl_types.IdlType.constructor_type_name = property(
     # FIXME: replace this with a [ConstructorAttribute] extended attribute
     lambda self: strip_suffix(self.base_type, 'Constructor'))
 
 
 def is_constructor_attribute(attribute):
     # FIXME: replace this with [ConstructorAttribute] extended attribute
     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']