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

Source/core/animation/animatable/AnimatableValue.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 21 matching lines @@
 #include "core/animation/animatable/AnimatableValue.h"
 
 #include "core/animation/animatable/AnimatableNeutral.h"
 #include "wtf/StdLibExtras.h"
 #include <algorithm>
 
 namespace blink {
 
 const AnimatableValue* AnimatableValue::neutralValue()
 {
-    DEFINE_STATIC_REF_WILL_BE_PERSISTENT(AnimatableNeutral, neutralSentinelValue, (AnimatableNeutral::create()));
+    static AnimatableNeutral* neutralSentinelValue = (new Persistent<AnimatableNeutral>(AnimatableNeutral::create()))->get();
     return neutralSentinelValue;
 }
 
-PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableValue::interpolate(const AnimatableValue* left, const AnimatableValue* right, double fraction)
+AnimatableValue* AnimatableValue::interpolate(const AnimatableValue* left, const AnimatableValue* right, double fraction)
 {
     ASSERT(left);
     ASSERT(right);
     ASSERT(!left->isNeutral());
     ASSERT(!right->isNeutral());
 
     if (fraction && fraction != 1 && left->isSameType(right))
         return left->interpolateTo(right, fraction);
 
     return defaultInterpolateTo(left, right, fraction);
 }
 
 } // namespace blink