Oilpan: Completely move core/animations/ to oilpan's heap

Source/core/animation/ActiveAnimations.h

Index: Source/core/animation/ActiveAnimations.h
diff --git a/Source/core/animation/ActiveAnimations.h b/Source/core/animation/ActiveAnimations.h
index 1805b15fe35c187c3ac1548176358deb58899d0b..2e6c8daf9a4f4abf6737183cd86266e7d1bd2288 100644
--- a/Source/core/animation/ActiveAnimations.h
+++ b/Source/core/animation/ActiveAnimations.h
@@ -61,7 +61,7 @@ public:
     CSSAnimations& cssAnimations() { return m_cssAnimations; }
     const CSSAnimations& cssAnimations() const { return m_cssAnimations; }
 
-    typedef HashCountedSet<AnimationPlayer*> AnimationPlayerSet;
+    typedef WillBeHeapHashSet<RawPtrWillBeWeakMember<AnimationPlayer> > AnimationPlayerSet;

[dstockwell, 2014/04/15 05:02:43]

Is there a HeapHashCountedSet? Although we don't rely on the count yet we will
in the future.

(animations add players to this set, currently there is at most one animation
per player, but that will change in the future).

[haraken, 2014/04/15 05:03:56]

Not yet, and that means that we need to implement it. I'll ask erikcorry@.

     // AnimationPlayers which have animations targeting this element.
     const AnimationPlayerSet& players() const { return m_players; }
     AnimationPlayerSet& players() { return m_players; }