Use Traversal<>::firstChild() instead of firstWithin() when iterating over children

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 3de9ab3dcdfebab5947b3d0ded4f1497b7715d9b..1169ae70b3346a9c117448f83aa7f7c336948e0f 100644
--- a/Source/core/rendering/svg/RenderSVGResourcePattern.cpp
+++ b/Source/core/rendering/svg/RenderSVGResourcePattern.cpp
@@ -258,7 +258,7 @@ PassOwnPtr<ImageBuffer> RenderSVGResourcePattern::createTileImage(const PatternA
         contentTransformation = tileImageTransform;
 
     // Draw the content into the ImageBuffer.
-    for (Element* element = ElementTraversal::firstWithin(*attributes.patternContentElement()); element; element = ElementTraversal::nextSibling(*element)) {
+    for (Element* element = ElementTraversal::firstChild(*attributes.patternContentElement()); element; element = ElementTraversal::nextSibling(*element)) {
         if (!element->isSVGElement() || !element->renderer())
             continue;
         if (element->renderer()->needsLayout())