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

Source/core/animation/animatable/AnimatableLengthBoxAndBool.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 42 matching lines @@
     if (!box()->isLengthBox() || !lengthBoxAndBool->box()->isLengthBox())
         return AnimatableValue::usesDefaultInterpolation(box(), lengthBoxAndBool->box());
     const AnimatableLengthBox* boxA = toAnimatableLengthBox(box());
     const AnimatableLengthBox* boxB = toAnimatableLengthBox(lengthBoxAndBool->box());
     return !sidesHaveSameUnits(boxA->left(), boxB->left())
         || !sidesHaveSameUnits(boxA->right(), boxB->right())
         || !sidesHaveSameUnits(boxA->top(), boxB->top())
         || !sidesHaveSameUnits(boxA->bottom(), boxB->bottom());
 }
 
-PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableLengthBoxAndBool::interpolateTo(const AnimatableValue* value, double fraction) const
+AnimatableValue* AnimatableLengthBoxAndBool::interpolateTo(const AnimatableValue* value, double fraction) const
 {
     const AnimatableLengthBoxAndBool* lengthBoxAndBool = toAnimatableLengthBoxAndBool(value);
     if (usesDefaultInterpolationWith(lengthBoxAndBool))
         return defaultInterpolateTo(this, value, fraction);
     return AnimatableLengthBoxAndBool::create(
         AnimatableValue::interpolate(box(), lengthBoxAndBool->box(), fraction),
         flag());
 }
 
 bool AnimatableLengthBoxAndBool::equalTo(const AnimatableValue* value) const
 {
     const AnimatableLengthBoxAndBool* lengthBox = toAnimatableLengthBoxAndBool(value);
     return box()->equals(lengthBox->box()) && flag() == lengthBox->flag();
 }
 
 DEFINE_TRACE(AnimatableLengthBoxAndBool)
 {
     visitor->trace(m_box);
     AnimatableValue::trace(visitor);
 }
 
 }