Remove v8_interface.constructor_argument

Source/bindings/scripts/v8_methods.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 212 matching lines @@
     else:
         base_name = v8_utilities.cpp_name(method)
 
     cpp_method_name = v8_utilities.scoped_name(interface, method, base_name)
     return '%s(%s)' % (cpp_method_name, ', '.join(cpp_arguments))
 
 
 def v8_set_return_value(interface_name, method, cpp_value, for_main_world=False):
     idl_type = method.idl_type
     extended_attributes = method.extended_attributes
-    if idl_type.name == 'void':
+    if not idl_type or idl_type.name == 'void':
+        # Constructors and void methods don't have a return type
         return None
 
     release = False
     # [CallWith=ScriptState], [RaisesException]
     if (has_extended_attribute_value(method, 'CallWith', 'ScriptState') or
         'RaisesException' in extended_attributes or
         idl_type.is_union_type):
         cpp_value = 'result'  # use local variable for value
         release = idl_type.release
 
@@ skipping 38 matching lines @@
 
 
 def union_arguments(idl_type):
     """Return list of ['result0Enabled', 'result0', 'result1Enabled', ...] for union types, for use in setting return value"""
     return [arg
             for i in range(len(idl_type.member_types))
             for arg in ['result%sEnabled' % i, 'result%s' % i]]
 
 IdlType.union_arguments = property(lambda self: None)
 IdlUnionType.union_arguments = property(union_arguments)