Reviewed by Darin.

    Reviewed by Darin.

        Make some of the refcounted style objects start out with a refcount of 1.

        * rendering/DataRef.h:
        Make a DeprecatedDataRef class which is just a copy of the old DataRef class.
        Change DataRef to use ::create() and ::copy() instead of the constructors.
        Change DataRef's pointer to be a RefPtr instead.

        * rendering/RenderStyle.cpp:
        (WebCore::StyleMarqueeData::StyleMarqueeData):
        (WebCore::StyleFlexibleBoxData::StyleFlexibleBoxData):
        (WebCore::StyleMultiColData::StyleMultiColData):
        (WebCore::StyleTransformData::StyleTransformData):
        Start with a RefCount of 1.

        * rendering/RenderStyle.h:
        * rendering/SVGRenderStyle.h:
        Add ::create() and ::copy() methods. Make not yet converted classes use DeprecatedDataRef.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@30572 268f45cc-cd09-0410-ab3c-d52691b4dbfc