Replace RenderArena with PartitionAlloc.

Source/core/rendering/RenderImage.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011-2012. All rights reserved.
  *
@@ skipping 45 matching lines @@
     : RenderReplaced(element, IntSize())
     , m_needsToSetSizeForAltText(false)
     , m_didIncrementVisuallyNonEmptyPixelCount(false)
     , m_isGeneratedContent(false)
 {
     updateAltText();
 }
 
 RenderImage* RenderImage::createAnonymous(Document* document)
 {
-    RenderImage* image = new (document->renderArena()) RenderImage(0);
+    RenderImage* image = new RenderImage(0);
     image->setDocumentForAnonymous(document);
     return image;
 }
 
 RenderImage::~RenderImage()
 {
     ASSERT(m_imageResource);
     m_imageResource->shutdown();
 }
 
@@ skipping 498 matching lines @@
         return 0;
 
     CachedImage* cachedImage = m_imageResource->cachedImage();
     if (cachedImage && cachedImage->image() && cachedImage->image()->isSVGImage())
         return static_cast<SVGImage*>(cachedImage->image())->embeddedContentBox();
 
     return 0;
 }
 
 } // namespace WebCore