Replace RenderArena with PartitionAlloc.

Source/core/rendering/RenderButton.cpp

 /**
  * Copyright (C) 2005 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 108 matching lines @@
 {
     if (str.isEmpty()) {
         if (m_buttonText) {
             m_buttonText->destroy();
             m_buttonText = 0;
         }
     } else {
         if (m_buttonText)
             m_buttonText->setText(str.impl());
         else {
-            m_buttonText = new (renderArena()) RenderTextFragment(document(), str.impl());
+            m_buttonText = new RenderTextFragment(document(), str.impl());
             m_buttonText->setStyle(style());
             addChild(m_buttonText);
         }
     }
 }
 
 String RenderButton::text() const
 {
     return m_buttonText ? m_buttonText->text() : 0;
 }
@@ skipping 24 matching lines @@
         // baseline for the empty case manually here.
         if (direction == HorizontalLine)
             return marginTop() + borderTop() + paddingTop() + contentHeight();
 
         return marginRight() + borderRight() + paddingRight() + contentWidth();
     }
     return RenderFlexibleBox::baselinePosition(baseline, firstLine, direction, linePositionMode);
 }
 
 } // namespace WebCore