[Oilpan] Migrate most classes under core/animations to Oilpan heap.

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 331 matching lines @@
 {
     if (hasRareData())
         return elementRareData()->elementAnimations();
     return nullptr;
 }
 
 ElementAnimations& Element::ensureElementAnimations()
 {
     ElementRareData& rareData = ensureElementRareData();
     if (!rareData.elementAnimations())
-        rareData.setElementAnimations(adoptPtrWillBeNoop(new ElementAnimations()));
+        rareData.setElementAnimations(new ElementAnimations);
     return *rareData.elementAnimations();
 }
 
 bool Element::hasAnimations() const
 {
     if (!hasRareData())
         return false;
 
     ElementAnimations* elementAnimations = elementRareData()->elementAnimations();
     return elementAnimations && !elementAnimations->isEmpty();
@@ skipping 3107 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink