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

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 c0a6d0bb178bf2757cf2a4db3fcf990c2ee799f8..2f92188a50881e6314d4238c1f0a1829d1244b50 100644
--- a/Source/core/rendering/svg/RenderSVGResourceClipper.cpp
+++ b/Source/core/rendering/svg/RenderSVGResourceClipper.cpp
@@ -91,7 +91,7 @@ bool RenderSVGResourceClipper::tryPathOnlyClipping(GraphicsContext* context,
     WindRule clipRule = RULE_NONZERO;
     Path clipPath = Path();
 
-    for (Element* childElement = ElementTraversal::firstWithin(*element()); childElement; childElement = ElementTraversal::nextSibling(*childElement)) {
+    for (Element* childElement = ElementTraversal::firstChild(*element()); childElement; childElement = ElementTraversal::nextSibling(*childElement)) {
         RenderObject* renderer = childElement->renderer();
         if (!renderer)
             continue;