WTF::HashTable: Implement move semantics for keys and values.

third_party/WebKit/Source/core/dom/SpaceSplitString.cpp

 /*
  * Copyright (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2007, 2008, 2011, 2012 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,
@@ skipping 156 matching lines @@
 }
 
 SpaceSplitString::Data::~Data()
 {
     if (!m_keyString.isNull())
         sharedDataMap().remove(m_keyString);
 }
 
 PassRefPtr<SpaceSplitString::Data> SpaceSplitString::Data::create(const AtomicString& string)
 {
-    Data*& data = sharedDataMap().add(string, 0).storedValue->value;
+    Data*& data = sharedDataMap().add(string, nullptr).storedValue->value;
     if (!data) {
         data = new Data(string);
         return adoptRef(data);
     }
     return data;
 }
 
 PassRefPtr<SpaceSplitString::Data> SpaceSplitString::Data::createUnique(const Data& other)
 {
     return adoptRef(new SpaceSplitString::Data(other));
 }
 
 SpaceSplitString::Data::Data(const AtomicString& string)
     : m_keyString(string)
 {
     ASSERT(!string.isNull());
     createVector(string);
 }
 
 SpaceSplitString::Data::Data(const SpaceSplitString::Data& other)
     : RefCounted<Data>()
     , m_vector(other.m_vector)
 {
     // Note that we don't copy m_keyString to indicate to the destructor that there's nothing
     // to be removed from the sharedDataMap().
 }
 
 } // namespace blink