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

Source/core/animation/PathSVGInterpolation.h

Index: Source/core/animation/PathSVGInterpolation.h
diff --git a/Source/core/animation/PathSVGInterpolation.h b/Source/core/animation/PathSVGInterpolation.h
index 99b7848fdfae488e6313d745cd8449a1e0645264..4fa41d9fe0ded31660ef3af3c0f81168ac9e8686 100644
--- a/Source/core/animation/PathSVGInterpolation.h
+++ b/Source/core/animation/PathSVGInterpolation.h
@@ -12,7 +12,7 @@ namespace blink {
 
 class PathSVGInterpolation : public SVGInterpolation {
 public:
-    static PassRefPtrWillBeRawPtr<PathSVGInterpolation> maybeCreate(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute);
+    static PathSVGInterpolation* maybeCreate(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute);
 
     PassRefPtrWillBeRawPtr<SVGPropertyBase> interpolatedValue(SVGElement&) const final;
 
@@ -22,7 +22,7 @@ public:
     }
 
 private:
-    PathSVGInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute,
+    PathSVGInterpolation(InterpolableValue* start, InterpolableValue* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute,
         Vector<SVGPathSegType> pathSegTypes)
         : SVGInterpolation(start, end, attribute)
     {