Replace RenderArena with PartitionAlloc

Source/core/rendering/RenderDeprecatedFlexibleBox.cpp

Index: Source/core/rendering/RenderDeprecatedFlexibleBox.cpp
diff --git a/Source/core/rendering/RenderDeprecatedFlexibleBox.cpp b/Source/core/rendering/RenderDeprecatedFlexibleBox.cpp
index ded6ea3614dabbef4a0b33945d4bef86889cee60..ff04969115f344f93ea20af0b3cc998ad2774e63 100644
--- a/Source/core/rendering/RenderDeprecatedFlexibleBox.cpp
+++ b/Source/core/rendering/RenderDeprecatedFlexibleBox.cpp
@@ -142,7 +142,7 @@ RenderDeprecatedFlexibleBox::~RenderDeprecatedFlexibleBox()
 
 RenderDeprecatedFlexibleBox* RenderDeprecatedFlexibleBox::createAnonymous(Document* document)
 {
-    RenderDeprecatedFlexibleBox* renderer = new (document->renderArena()) RenderDeprecatedFlexibleBox(0);
+    RenderDeprecatedFlexibleBox* renderer = new RenderDeprecatedFlexibleBox(0);
     renderer->setDocumentForAnonymous(document);
     return renderer;
 }