IDL compiler: Remove creationContext from v8SetReturnValue* in Python CG

Source/bindings/scripts/unstable/v8_callback_interface.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 37 matching lines @@
     'core/dom/ExecutionContext.h',
     'bindings/v8/V8Binding.h',
     'bindings/v8/V8Callback.h',
     'wtf/Assertions.h',
 ])
 CPP_TO_V8_CONVERSION = 'v8::Handle<v8::Value> {name}Handle = {cpp_value_to_v8_value};'
 
 
 def cpp_to_v8_conversion(idl_type, name):
     # Includes handled in includes_for_operation
-    this_cpp_value_to_v8_value = cpp_value_to_v8_value(idl_type, name, set(), 'isolate', creation_context='v8::Handle<v8::Object>()')
+    this_cpp_value_to_v8_value = cpp_value_to_v8_value(idl_type, name, set(), 'isolate')
     return CPP_TO_V8_CONVERSION.format(name=name, cpp_value_to_v8_value=this_cpp_value_to_v8_value)
 
 
 def generate_callback_interface(callback_interface):
     includes.clear()
     includes.update(CALLBACK_INTERFACE_CPP_INCLUDES)
 
     methods = [generate_method(operation) for operation in callback_interface.operations]
     template_contents = {
         'cpp_class_name': callback_interface.name,
@@ skipping 39 matching lines @@
         }
 
     argument_declarations = [argument_declaration(argument) for argument in arguments]
     if call_with_this_handle:
         argument_declarations.insert(0, 'ScriptValue thisValue')
     return  {
         'argument_declarations': argument_declarations,
         'arguments': [generate_argument(argument) for argument in arguments],
         'handles': ['%sHandle' % argument.name for argument in arguments],
     }