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

Source/core/animation/LengthStyleInterpolation.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef LengthStyleInterpolation_h
 #define LengthStyleInterpolation_h
 
 #include "core/CoreExport.h"
 #include "core/animation/StyleInterpolation.h"
 #include "core/css/CSSPrimitiveValue.h"
 
 namespace blink {
 
 class ComputedStyle;
 class Length;
 
 class CORE_EXPORT LengthStyleInterpolation : public StyleInterpolation {
 public:
     typedef void (ComputedStyle::*LengthSetter)(const Length&);
     typedef void NonInterpolableType;
 
-    static PassRefPtrWillBeRawPtr<LengthStyleInterpolation> create(const CSSValue& start, const CSSValue& end, CSSPropertyID id, InterpolationRange range)
+    static LengthStyleInterpolation* create(const CSSValue& start, const CSSValue& end, CSSPropertyID id, InterpolationRange range)
     {
-        return adoptRefWillBeNoop(new LengthStyleInterpolation(toInterpolableValue(start, id), toInterpolableValue(end, id), id, range));
+        return new LengthStyleInterpolation(toInterpolableValue(start, id), toInterpolableValue(end, id), id, range);
     }
 
     static bool canCreateFrom(const CSSValue&, CSSPropertyID = CSSPropertyInvalid);
 
     void apply(StyleResolverState&) const override;
 
     DECLARE_VIRTUAL_TRACE();
 
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> toInterpolableValue(const CSSValue&, CSSPropertyID = CSSPropertyInvalid);
+    static InterpolableValue* toInterpolableValue(const CSSValue&, CSSPropertyID = CSSPropertyInvalid);
     static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> fromInterpolableValue(const InterpolableValue&, InterpolationRange);
     static void applyInterpolableValue(CSSPropertyID, const InterpolableValue&, InterpolationRange, StyleResolverState&, LengthSetter);
 
 private:
-    LengthStyleInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, CSSPropertyID id, InterpolationRange range)
+    LengthStyleInterpolation(InterpolableValue* start, InterpolableValue* end, CSSPropertyID id, InterpolationRange range)
         : StyleInterpolation(start, end, id)
         , m_range(range)
         , m_lengthSetter(nullptr)
     {
         if (isPixelsOrPercentOnly(*m_start) && isPixelsOrPercentOnly(*m_end))
             m_lengthSetter = lengthSetterForProperty(id);
     }
 
     static bool isPixelsOrPercentOnly(const InterpolableValue&);
     static LengthSetter lengthSetterForProperty(CSSPropertyID);
 
     InterpolationRange m_range;
     LengthSetter m_lengthSetter;
 };
 
 }
 
 #endif