Replace RenderArena with PartitionAlloc.

Source/core/svg/SVGSVGElement.cpp

Index: Source/core/svg/SVGSVGElement.cpp
diff --git a/Source/core/svg/SVGSVGElement.cpp b/Source/core/svg/SVGSVGElement.cpp
index 929d9f85222c0ed515f2b6853603fbdab9beb2af..c3bd19baf8f27a9a1fefafb0224b339196ff46ea 100644
--- a/Source/core/svg/SVGSVGElement.cpp
+++ b/Source/core/svg/SVGSVGElement.cpp
@@ -480,12 +480,12 @@ bool SVGSVGElement::rendererIsNeeded(const NodeRenderingContext& context)
     return StyledElement::rendererIsNeeded(context);
 }
 
-RenderObject* SVGSVGElement::createRenderer(RenderArena* arena, RenderStyle*)
+RenderObject* SVGSVGElement::createRenderer(RenderStyle*)
 {
     if (isOutermostSVGSVGElement())
-        return new (arena) RenderSVGRoot(this);
+        return new RenderSVGRoot(this);
 
-    return new (arena) RenderSVGViewportContainer(this);
+    return new RenderSVGViewportContainer(this);
 }
 
 Node::InsertionNotificationRequest SVGSVGElement::insertedInto(ContainerNode* rootParent)