Enable animVal support for SVGAnimatedEnumeration
        https://bugs.webkit.org/show_bug.cgi?id=82459

        Rubber-stamped by Zoltan Herczeg.

        Make highestEnumValue() return an unsigned to avoid casting in SVGAnimatedEnumerationPropertyTearOff.
        Fixes the last chromium build failure on the debug carnary bots.

        * svg/SVGComponentTransferFunctionElement.h:
        * svg/SVGFEBlendElement.h:
        * svg/SVGFEColorMatrixElement.h:
        * svg/SVGFECompositeElement.h:
        * svg/SVGFEConvolveMatrixElement.h:
        * svg/SVGFEDisplacementMapElement.h:
        * svg/SVGFEMorphologyElement.h:
        * svg/SVGFETurbulenceElement.h:
        * svg/SVGGradientElement.h:
        * svg/SVGMarkerElement.h:
        * svg/SVGTextContentElement.h:
        * svg/SVGTextPathElement.h:
        * svg/SVGUnitTypes.h:
        * svg/properties/SVGAnimatedEnumerationPropertyTearOff.h:
        (WebCore::SVGAnimatedEnumerationPropertyTearOff::setBaseVal):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@113009 268f45cc-cd09-0410-ab3c-d52691b4dbfc