Parsing error after update WebCore Elemental

I updated WebCore (third_party) from de Dart Project and when run build script the following error occurs:

Traceback (most recent call last):

  File "./scripts/elemental_fremontcutbuilder.py", line 217, in <module>

    sys.exit(main())

  File "./scripts/elemental_fremontcutbuilder.py", line 214, in main

    return build_database(idl_files, database_dir)

  File "./scripts/elemental_fremontcutbuilder.py", line 139, in build_database

    builder.import_idl_file(file_name, webkit_options)

  File "/usr/local/frameworks/gwt/trunk/elemental/idl/scripts/databasebuilder.py", line 474, in import_idl_file

    idl_file = self._load_idl_file(file_path, import_options)

  File "/usr/local/frameworks/gwt/trunk/elemental/idl/scripts/databasebuilder.py", line 88, in _load_idl_file

    raise RuntimeError('Failed to load file %s: %s' % (file_name, e))

RuntimeError: Failed to load file ./scripts/../third_party/WebCore/html/canvas/Int8Array.idl: At line 37 offset 26: Expected "]" or "(" or "," but "c" found: "        TypedArray=signed char"

Traceback (most recent call last):

  File "./scripts/elementaldomgenerator.py", line 164, in <module>

    sys.exit(main())

  File "./scripts/elementaldomgenerator.py", line 155, in main

    database_dir, use_database_cache)

  File "./scripts/elementaldomgenerator.py", line 120, in GenerateDOM

    systems = systems)

  File "/usr/local/frameworks/gwt/trunk/elemental/idl/scripts/elementalgenerator.py", line 279, in Generate

    self.PopulateMixinBase(self._database.GetInterface('ElementalMixinBase'), mixins)

  File "/usr/local/frameworks/gwt/trunk/elemental/idl/scripts/database.py", line 188, in GetInterface

    raise RuntimeError('Interface %s is not loaded' % interface_name)

RuntimeError: Interface ElementalMixinBase is not loaded

-------------------------------------------------------------------------------------------------------------------------------

File /../third_party/WebCore/html/canvas/Int8Array.idl:

module html {

    interface [

        ConstructorTemplate=TypedArray,

        ConstructorParameters=1,

        NumericIndexedGetter,

        CustomIndexedSetter,

        JSGenerateToNativeObject,

        JSNoStaticTables,

        CustomToJSObject,

        DoNotCheckConstants,

        TypedArray=signed char

    ] Int8Array : ArrayBufferView {

        const unsigned long BYTES_PER_ELEMENT = 1;

        readonly attribute unsigned long length;

        Int8Array subarray(in [Optional=DefaultIsUndefined] long start,

                           in [Optional] long end);

        // void set(in Int8Array array, [Optional] in unsigned long offset);

        // void set(in sequence<long> array, [Optional] in unsigned long offset);

        void set();

    };

}

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