Add move constructor and assignment operator to RefPtr class

Source/wtf/text/AtomicString.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Apple 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 51 matching lines @@
     }
 
     template<unsigned charactersCount>
     ALWAYS_INLINE AtomicString(const char (&characters)[charactersCount], ConstructFromLiteralTag)
         : m_string(addFromLiteralData(characters, charactersCount - 1))
     {
         COMPILE_ASSERT(charactersCount > 1, AtomicStringFromLiteralNotEmpty);
         COMPILE_ASSERT((charactersCount - 1 <= ((unsigned(~0) - sizeof(StringImpl)) / sizeof(LChar))), AtomicStringFromLiteralCannotOverflow);
     }
 
-#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
-    // We have to declare the copy constructor and copy assignment operator as well, otherwise
-    // they'll be implicitly deleted by adding the move constructor and move assignment operator.
-    // FIXME: Instead of explicitly casting to String&& here, we should use std::move, but that requires us to
-    // have a standard library that supports move semantics.
-    AtomicString(const AtomicString& other) : m_string(other.m_string) { }
-    AtomicString(AtomicString&& other) : m_string(static_cast<String&&>(other.m_string)) { }
-    AtomicString& operator=(const AtomicString& other) { m_string = other.m_string; return *this; }
-    AtomicString& operator=(AtomicString&& other) { m_string = static_cast<String&&>(other.m_string); return *this; }
-#endif
-
     // Hash table deleted values, which are only constructed and never copied or destroyed.
     AtomicString(WTF::HashTableDeletedValueType) : m_string(WTF::HashTableDeletedValue) { }
     bool isHashTableDeletedValue() const { return m_string.isHashTableDeletedValue(); }
 
     static StringImpl* find(const StringImpl*);
 
     operator const String&() const { return m_string; }
     const String& string() const { return m_string; };
 
     StringImpl* impl() const { return m_string.impl(); }
@@ skipping 171 matching lines @@
 using WTF::nullAtom;
 using WTF::emptyAtom;
 using WTF::starAtom;
 using WTF::xmlAtom;
 using WTF::xmlnsAtom;
 using WTF::xlinkAtom;
 #endif
 
 #include "wtf/text/StringConcatenate.h"
 #endif // AtomicString_h