Use new Traversal<> API more in the code base

Source/core/rendering/svg/RenderSVGResourceClipper.cpp

Index: Source/core/rendering/svg/RenderSVGResourceClipper.cpp
diff --git a/Source/core/rendering/svg/RenderSVGResourceClipper.cpp b/Source/core/rendering/svg/RenderSVGResourceClipper.cpp
index 2f92188a50881e6314d4238c1f0a1829d1244b50..e7c2f6454e4fc681ef53c19bd98a6a1cba4e6dab 100644
--- a/Source/core/rendering/svg/RenderSVGResourceClipper.cpp
+++ b/Source/core/rendering/svg/RenderSVGResourceClipper.cpp
@@ -91,14 +91,14 @@ bool RenderSVGResourceClipper::tryPathOnlyClipping(GraphicsContext* context,
     WindRule clipRule = RULE_NONZERO;
     Path clipPath = Path();
 
-    for (Element* childElement = ElementTraversal::firstChild(*element()); childElement; childElement = ElementTraversal::nextSibling(*childElement)) {
+    for (SVGElement* childElement = Traversal<SVGElement>::firstChild(*element()); childElement; childElement = Traversal<SVGElement>::nextSibling(*childElement)) {
         RenderObject* renderer = childElement->renderer();
         if (!renderer)
             continue;
         // Only shapes or paths are supported for direct clipping. We need to fallback to masking for texts.
         if (renderer->isSVGText())
             return false;
-        if (!childElement->isSVGElement() || !toSVGElement(childElement)->isSVGGraphicsElement())
+        if (!childElement->isSVGGraphicsElement())
             continue;
         SVGGraphicsElement* styled = toSVGGraphicsElement(childElement);
         RenderStyle* style = renderer->style();