Use a bitmask for SVG render object types

Source/core/rendering/svg/RenderSVGForeignObject.h

Index: Source/core/rendering/svg/RenderSVGForeignObject.h
diff --git a/Source/core/rendering/svg/RenderSVGForeignObject.h b/Source/core/rendering/svg/RenderSVGForeignObject.h
index 63cdac1d35bfe23d082a64d73b6d5ed4608393d8..93408b69c7bf108ae097737a216c913bab737b74 100644
--- a/Source/core/rendering/svg/RenderSVGForeignObject.h
+++ b/Source/core/rendering/svg/RenderSVGForeignObject.h
@@ -33,6 +33,7 @@ public:
     virtual ~RenderSVGForeignObject();
 
     virtual const char* renderName() const { return "RenderSVGForeignObject"; }
+    virtual SVGType getSVGType() const OVERRIDE { return IsSVGForeignObject; }
 
     virtual void paint(PaintInfo&, const LayoutPoint&);
 
@@ -48,7 +49,6 @@ public:
 
     virtual bool nodeAtFloatPoint(const HitTestRequest&, HitTestResult&, const FloatPoint& pointInParent, HitTestAction);
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
-    virtual bool isSVGForeignObject() const { return true; }
 
     virtual void mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0) const OVERRIDE;
     virtual const RenderObject* pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const OVERRIDE;