Replace RenderArena with PartitionAlloc.

Source/core/page/Page.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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,
@@ skipping 66 matching lines @@
 class ScrollableArea;
 class ScrollingCoordinator;
 class Settings;
 class StorageNamespace;
 class ValidationMessageClient;
 
 typedef uint64_t LinkHash;
 
 float deviceScaleFactor(Frame*);
 
-struct ArenaSize {
-    ArenaSize(size_t treeSize, size_t allocated)
-        : treeSize(treeSize)
-        , allocated(allocated)
-    {
-    }
-    size_t treeSize;
-    size_t allocated;
-};
-
 class Page : public Supplementable<Page> {
     WTF_MAKE_NONCOPYABLE(Page);
     friend class Settings;
 public:
     static void scheduleForcedStyleRecalcForAllPages();
 
     // It is up to the platform to ensure that non-null clients are provided where required.
     struct PageClients {
         WTF_MAKE_NONCOPYABLE(PageClients); WTF_MAKE_FAST_ALLOCATED;
     public:
         PageClients();
         ~PageClients();
 
         ChromeClient* chromeClient;
         ContextMenuClient* contextMenuClient;
         EditorClient* editorClient;
         DragClient* dragClient;
         InspectorClient* inspectorClient;
         BackForwardClient* backForwardClient;
     };
 
     explicit Page(PageClients&);
     ~Page();
 
-    ArenaSize renderTreeSize() const;
-
     void setNeedsRecalcStyleInAllFrames();
 
     RenderTheme* theme() const { return m_theme.get(); }
 
     ViewportArguments viewportArguments() const;
 
     static void refreshPlugins(bool reload);
     PluginData* pluginData() const;
 
     EditorClient* editorClient() const { return m_editorClient; }
@@ skipping 215 matching lines @@
 #endif
 
     const OwnPtr<PageConsole> m_console;
 
     HashSet<MultisamplingChangedObserver*> m_multisamplingChangedObservers;
 };
 
 } // namespace WebCore
     
 #endif // Page_h