Replace RenderArena with PartitionAlloc.

Source/core/dom/Node.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 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
@@ skipping 57 matching lines @@
 class NodeListsNodeData;
 class NodeRareData;
 class NodeRenderingContext;
 class PlatformGestureEvent;
 class PlatformKeyboardEvent;
 class PlatformMouseEvent;
 class PlatformWheelEvent;
 class QualifiedName;
 class RadioNodeList;
 class RegisteredEventListener;
-class RenderArena;
 class RenderBox;
 class RenderBoxModelObject;
 class RenderObject;
 class RenderStyle;
 class ShadowRoot;
 class TagNodeList;
 class TouchEvent;
 
 typedef int ExceptionCode;
 
@@ skipping 62 matching lines @@
         DOCUMENT_POSITION_DISCONNECTED = 0x01,
         DOCUMENT_POSITION_PRECEDING = 0x02,
         DOCUMENT_POSITION_FOLLOWING = 0x04,
         DOCUMENT_POSITION_CONTAINS = 0x08,
         DOCUMENT_POSITION_CONTAINED_BY = 0x10,
         DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20,
     };
 
     static void init();
     static void shutdown();
+
 #if ENABLE(PARTITION_ALLOC)
-    // All Nodes are placed in their own heap partition for security.
+    // Nodes are placed in their own heap partition for security.
     // See http://crbug.com/246860 for detail.
     void* operator new(size_t);
     void operator delete(void*);
 #endif
 
     static bool isSupported(const String& feature, const String& version);
 
     static void startIgnoringLeaks();
     static void stopIgnoringLeaks();
 
@@ skipping 755 matching lines @@
 
 } //namespace
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::Node*);
 void showNodePath(const WebCore::Node*);
 #endif
 
 #endif