WTF::OwnPtr should behave similarly with the rest of WTF smart pointers

Source/core/page/animation/CSSPropertyAnimation.cpp

Index: Source/core/page/animation/CSSPropertyAnimation.cpp
diff --git a/Source/core/page/animation/CSSPropertyAnimation.cpp b/Source/core/page/animation/CSSPropertyAnimation.cpp
index 8fabfc00a7f0604fdd6cbb71d2ad3b707aca8891..5b31b8cd969b461626c9ead77572993e0e8c2a99 100644
--- a/Source/core/page/animation/CSSPropertyAnimation.cpp
+++ b/Source/core/page/animation/CSSPropertyAnimation.cpp
@@ -584,7 +584,7 @@ public:
     }
 
 private:
-    PassOwnPtr<ShadowData*> blendSimpleOrMatchedShadowLists(const AnimationBase* anim, double progress, const ShadowData* shadowA, const ShadowData* shadowB) const
+    PassOwnPtr<ShadowData> blendSimpleOrMatchedShadowLists(const AnimationBase* anim, double progress, const ShadowData* shadowA, const ShadowData* shadowB) const
     {
         OwnPtr<ShadowData> newShadowData;
         ShadowData* lastShadow = 0;
@@ -610,7 +610,7 @@ private:
         return newShadowData.release();
     }
 
-    PassOwnPtr<ShadowData*> blendMismatchedShadowLists(const AnimationBase* anim, double progress, const ShadowData* shadowA, const ShadowData* shadowB, int fromLength, int toLength) const
+    PassOwnPtr<ShadowData> blendMismatchedShadowLists(const AnimationBase* anim, double progress, const ShadowData* shadowA, const ShadowData* shadowB, int fromLength, int toLength) const
     {
         // The shadows in ShadowData are stored in reverse order, so when animating mismatched lists,
         // reverse them and match from the end.