Replace OwnPtr with WTF::Optional for optional recorders.

Source/wtf/TypeTraits.h

  /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009, 2010 Google Inc. All rights reserved.
  *
  * 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 258 matching lines @@
     };
 
     template <typename T> struct RemoveReference {
         typedef T Type;
     };
 
     template <typename T> struct RemoveReference<T&> {
         typedef T Type;
     };
 
+    template <typename T> struct RemoveReference<T&&> {
+        typedef T Type;
+    };
+
     template <typename T> struct RemoveExtent {
         typedef T Type;
     };
 
     template <typename T> struct RemoveExtent<T[]> {
         typedef T Type;
     };
 
     template <typename T, size_t N> struct RemoveExtent<T[N]> {
         typedef T Type;
@@ skipping 45 matching lines @@
 };
 
 template<typename T, typename U>
 struct NeedsTracing<std::pair<T, U>> {
     static const bool value = NeedsTracing<T>::value || NeedsTracing<U>::value || IsWeak<T>::value || IsWeak<U>::value;
 };
 
 } // namespace WTF
 
 #endif // TypeTraits_h