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

Source/core/page/animation/CSSPropertyAnimation.cpp

 /*
  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 566 matching lines @@
 
         if (fromLength == toLength || (fromLength <= 1 && toLength <= 1)) {
             (dst->*m_setter)(blendSimpleOrMatchedShadowLists(anim, progress, shadowA, shadowB), false);
             return;
         }
 
         (dst->*m_setter)(blendMismatchedShadowLists(anim, progress, shadowA, shadowB, fromLength, toLength), false);
     }
 
 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;
 
         while (shadowA || shadowB) {
             const ShadowData* srcShadow = shadowForBlending(shadowA, shadowB);
             const ShadowData* dstShadow = shadowForBlending(shadowB, shadowA);
 
             OwnPtr<ShadowData> blendedShadow = blendFunc(anim, srcShadow, dstShadow, progress);
             ShadowData* blendedShadowPtr = blendedShadow.get();
 
             if (!lastShadow)
                 newShadowData = blendedShadow.release();
             else
                 lastShadow->setNext(blendedShadow.release());
 
             lastShadow = blendedShadowPtr;
 
             shadowA = shadowA ? shadowA->next() : 0;
             shadowB = shadowB ? shadowB->next() : 0;
         }
 
         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.
         Vector<const ShadowData*, 4> fromShadows(fromLength);
         for (int i = fromLength - 1; i >= 0; --i) {
             fromShadows[i] = shadowA;
             shadowA = shadowA->next();
         }
 
         Vector<const ShadowData*, 4> toShadows(toLength);
@@ skipping 639 matching lines @@
 }
 
 int CSSPropertyAnimation::getNumProperties()
 {
     ensurePropertyMap();
 
     return gPropertyWrappers->size();
 }
 
 }