Replace RenderArena with PartitionAlloc.

Source/core/rendering/RenderFlexibleBox.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 119 matching lines @@
 {
     setChildrenInline(false); // All of our children must be block-level.
 }
 
 RenderFlexibleBox::~RenderFlexibleBox()
 {
 }
 
 RenderFlexibleBox* RenderFlexibleBox::createAnonymous(Document* document)
 {
-    RenderFlexibleBox* renderer = new (document->renderArena()) RenderFlexibleBox(0);
+    RenderFlexibleBox* renderer = new RenderFlexibleBox(0);
     renderer->setDocumentForAnonymous(document);
     return renderer;
 }
 
 const char* RenderFlexibleBox::renderName() const
 {
     return "RenderFlexibleBox";
 }
 
 static LayoutUnit marginLogicalWidthForChild(RenderBox* child, RenderStyle* parentStyle)
@@ skipping 1318 matching lines @@
             ASSERT(child);
             LayoutUnit lineCrossAxisExtent = lineContexts[lineNumber].crossAxisExtent;
             LayoutUnit originalOffset = lineContexts[lineNumber].crossAxisOffset - crossAxisStartEdge;
             LayoutUnit newOffset = contentExtent - originalOffset - lineCrossAxisExtent;
             adjustAlignmentForChild(child, newOffset - originalOffset);
         }
     }
 }
 
 }