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

Source/core/animation/ImageStyleInterpolation.h

Index: Source/core/animation/ImageStyleInterpolation.h
diff --git a/Source/core/animation/ImageStyleInterpolation.h b/Source/core/animation/ImageStyleInterpolation.h
index 30cb19882bdd1f4e733b4a8d7f15642a5582292b..960bb83d9ea0ddd70e1c67e1e0cd0679b83b9efc 100644
--- a/Source/core/animation/ImageStyleInterpolation.h
+++ b/Source/core/animation/ImageStyleInterpolation.h
@@ -11,9 +11,9 @@
 namespace blink {
 class ImageStyleInterpolation : public StyleInterpolation {
 public:
-    static PassRefPtrWillBeRawPtr<ImageStyleInterpolation> create(CSSValue& start, CSSValue& end, CSSPropertyID id)
+    static ImageStyleInterpolation* create(CSSValue& start, CSSValue& end, CSSPropertyID id)
     {
-        return adoptRefWillBeNoop(new ImageStyleInterpolation(&start, &end, id));
+        return new ImageStyleInterpolation(&start, &end, id);
     }
 
     DECLARE_VIRTUAL_TRACE();