Have ElementTraversal::firstWithin() take a reference

Source/core/svg/SVGElement.cpp

Index: Source/core/svg/SVGElement.cpp
diff --git a/Source/core/svg/SVGElement.cpp b/Source/core/svg/SVGElement.cpp
index b89fc02cf0af80cf7ba362e2614ae61e2535eb90..4fae87093762e3730a7a24663886f7d4df6899fd 100644
--- a/Source/core/svg/SVGElement.cpp
+++ b/Source/core/svg/SVGElement.cpp
@@ -264,7 +264,7 @@ String SVGElement::title() const
 
     // If we aren't an instance in a <use> or the <use> title was not found, then find the first
     // <title> child of this element.
-    Element* titleElement = ElementTraversal::firstWithin(this);
+    Element* titleElement = ElementTraversal::firstWithin(*this);
     for (; titleElement; titleElement = ElementTraversal::nextSkippingChildren(*titleElement, this)) {
         if (titleElement->hasTagName(SVGNames::titleTag) && titleElement->isSVGElement())
             break;