WIP - improve ScrollableArea handling.

Source/platform/scroll/ScrollAnimatorNone.cpp

Index: Source/platform/scroll/ScrollAnimatorNone.cpp
diff --git a/Source/platform/scroll/ScrollAnimatorNone.cpp b/Source/platform/scroll/ScrollAnimatorNone.cpp
index f772360775b22589de0f5e59adb544526a9233bf..8c0df06c739c5a19ceb245d0db9040bb35404d5f 100644
--- a/Source/platform/scroll/ScrollAnimatorNone.cpp
+++ b/Source/platform/scroll/ScrollAnimatorNone.cpp
@@ -45,11 +45,11 @@ const double kFrameRate = 60;
 const double kTickTime = 1 / kFrameRate;
 const double kMinimumTimerInterval = .001;
 
-PassRefPtr<ScrollAnimator> ScrollAnimator::create(ScrollableArea* scrollableArea)
+PassOwnPtr<ScrollAnimator> ScrollAnimator::create(ScrollableArea* scrollableArea)
 {
     if (scrollableArea && scrollableArea->scrollAnimatorEnabled())
-        return adoptRef(new ScrollAnimatorNone(scrollableArea));
-    return adoptRef(new ScrollAnimator(scrollableArea));
+        return adoptPtr(new ScrollAnimatorNone(scrollableArea));
+    return adoptPtr(new ScrollAnimator(scrollableArea));
 }
 
 ScrollAnimatorNone::Parameters::Parameters()