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

Source/core/animation/IntegerOptionalIntegerSVGInterpolation.h

Index: Source/core/animation/IntegerOptionalIntegerSVGInterpolation.h
diff --git a/Source/core/animation/IntegerOptionalIntegerSVGInterpolation.h b/Source/core/animation/IntegerOptionalIntegerSVGInterpolation.h
index d3b5e1f5f7e1d01b57d2243841b2b09478bba86c..eee0e90caa71d836e51f753b23231e7df409fe57 100644
--- a/Source/core/animation/IntegerOptionalIntegerSVGInterpolation.h
+++ b/Source/core/animation/IntegerOptionalIntegerSVGInterpolation.h
@@ -15,9 +15,9 @@ class SVGIntegerOptionalInteger;
 
 class IntegerOptionalIntegerSVGInterpolation : public SVGInterpolation {
 public:
-    static PassRefPtrWillBeRawPtr<IntegerOptionalIntegerSVGInterpolation> create(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute, int min)
+    static IntegerOptionalIntegerSVGInterpolation* create(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute, int min)
     {
-        return adoptRefWillBeNoop(new IntegerOptionalIntegerSVGInterpolation(toInterpolableValue(start), toInterpolableValue(end), attribute, min));
+        return new IntegerOptionalIntegerSVGInterpolation(toInterpolableValue(start), toInterpolableValue(end), attribute, min);
     }
 
     PassRefPtrWillBeRawPtr<SVGPropertyBase> interpolatedValue(SVGElement&) const final
@@ -31,13 +31,13 @@ public:
     }
 
 private:
-    IntegerOptionalIntegerSVGInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute, int min)
+    IntegerOptionalIntegerSVGInterpolation(InterpolableValue* start, InterpolableValue* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute, int min)
         : SVGInterpolation(start, end, attribute)
         , m_min(min)
     {
     }
 
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> toInterpolableValue(SVGPropertyBase*);
+    static InterpolableValue* toInterpolableValue(SVGPropertyBase*);
 
     static PassRefPtrWillBeRawPtr<SVGIntegerOptionalInteger> fromInterpolableValue(const InterpolableValue&, int);