Replace RenderArena with PartitionAlloc.

Source/core/rendering/BidiRun.h

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  *
  * 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.
@@ skipping 28 matching lines @@
         , m_object(object)
         , m_box(0)
     {
         // Stored in base class to save space.
         m_hasHyphen = false;
         m_startsSegment = false;
     }
 
     void destroy();
 
-    // Overloaded new operator.
-    void* operator new(size_t, RenderArena*);
-
-    // Overridden to prevent the normal delete from being called.
-    void operator delete(void*, size_t);
+#if ENABLE(PARTITION_ALLOC)
+    void* operator new(size_t);
+#endif
 
     BidiRun* next() { return static_cast<BidiRun*>(m_next); }
     RenderObject* object() { return m_object; }
 
 private:
-    // The normal operator new is disallowed.
-    void* operator new(size_t) throw();
+#if ENABLE(PARTITION_ALLOC)
+    void operator delete(void*);
+#endif
 
 public:
     RenderObject* m_object;
     InlineBox* m_box;
 };
 
 }
 
 #endif // BidiRun_h