Reviewed by Dimitri Glazkov.

        Upstream V8 bindings for V8DomWindow.
        https://bugs.webkit.org/show_bug.cgi?id=25869

        * bindings/v8/custom/V8DOMWindowCustom.cpp:
        (WebCore::V8Custom::WindowSetTimeoutImpl): Moved from v8_custom.cpp.
        (WebCore::isAscii): Moved from v8_custom.cpp.
        (WebCore::convertBase64): Moved from v8_custom.cpp.
        (WebCore::CALLBACK_FUNC_DECL): Moved from v8_custom.cpp.
        (WebCore::eventNameFromAttributeName): Moved from v8_custom.cpp.
        (WebCore::ACCESSOR_SETTER): Moved from v8_custom.cpp.
        (WebCore::ACCESSOR_GETTER): Moved from v8_custom.cpp.
        (WebCore::NAMED_ACCESS_CHECK): Moved from v8_custom.cpp.
        (WebCore::INDEXED_ACCESS_CHECK): Moved from v8_custom.cpp.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@43936 268f45cc-cd09-0410-ab3c-d52691b4dbfc