Use new Traversal<> API more in the code base

Source/core/rendering/svg/RenderSVGResourcePattern.cpp

Index: Source/core/rendering/svg/RenderSVGResourcePattern.cpp
diff --git a/Source/core/rendering/svg/RenderSVGResourcePattern.cpp b/Source/core/rendering/svg/RenderSVGResourcePattern.cpp
index 1169ae70b3346a9c117448f83aa7f7c336948e0f..6c87ce5be0d4f20dff85a8b7ad408de7d1b8f054 100644
--- a/Source/core/rendering/svg/RenderSVGResourcePattern.cpp
+++ b/Source/core/rendering/svg/RenderSVGResourcePattern.cpp
@@ -258,8 +258,8 @@ PassOwnPtr<ImageBuffer> RenderSVGResourcePattern::createTileImage(const PatternA
         contentTransformation = tileImageTransform;
 
     // Draw the content into the ImageBuffer.
-    for (Element* element = ElementTraversal::firstChild(*attributes.patternContentElement()); element; element = ElementTraversal::nextSibling(*element)) {
-        if (!element->isSVGElement() || !element->renderer())
+    for (SVGElement* element = Traversal<SVGElement>::firstChild(*attributes.patternContentElement()); element; element = Traversal<SVGElement>::nextSibling(*element)) {
+        if (!element->renderer())
             continue;
         if (element->renderer()->needsLayout())
             return nullptr;