Use a class for CodeGeneratorV8

Source/bindings/scripts/unstable/v8_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 26 matching lines @@
 
 import v8_attributes
 from v8_globals import includes
 import v8_methods
 import v8_types
 from v8_types import inherits_interface, is_interface_type
 import v8_utilities
 from v8_utilities import capitalize, conditional_string, cpp_name, has_extended_attribute_value, runtime_enabled_function_name
 
 
-INTERFACE_H_INCLUDES = set([
+INTERFACE_H_INCLUDES = frozenset([
     'bindings/v8/V8Binding.h',
     'bindings/v8/V8DOMWrapper.h',
     'bindings/v8/WrapperTypeInfo.h',
     'heap/Handle.h',
 ])
-INTERFACE_CPP_INCLUDES = set([
+INTERFACE_CPP_INCLUDES = frozenset([
     'RuntimeEnabledFeatures.h',
     'bindings/v8/ExceptionState.h',
     'bindings/v8/V8DOMConfiguration.h',
     'bindings/v8/V8ObjectConstructor.h',
     'core/dom/ContextFeatures.h',
     'core/dom/Document.h',
     'platform/TraceEvent.h',
     'wtf/GetPtr.h',  # FIXME: remove if can eliminate WTF::getPtr
     'wtf/RefPtr.h',
 ])
 
 
 def generate_interface(interface):
     includes.clear()
     includes.update(INTERFACE_CPP_INCLUDES)
-    header_includes = INTERFACE_H_INCLUDES
+    header_includes = set(INTERFACE_H_INCLUDES)
 
     parent_interface = interface.parent
     if parent_interface:
         header_includes.update(v8_types.includes_for_type(parent_interface))
     extended_attributes = interface.extended_attributes
 
     is_audio_buffer = inherits_interface(interface.name, 'AudioBuffer')
     if is_audio_buffer:
         includes.add('modules/webaudio/AudioBuffer.h')
 
@@ skipping 630 matching lines @@
         deleter = next(
             method
             for method in interface.operations
             if ('deleter' in method.specials and
                 len(method.arguments) == 1 and
                 method.arguments[0].idl_type == 'DOMString'))
     except StopIteration:
         return None
 
     return property_deleter(deleter)