Add virtual destructors to IntersectionObserverCallback

third_party/WebKit/Source/core/dom/IntersectionObservation.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IntersectionObservation_h
 #define IntersectionObservation_h
 
 #include "platform/geometry/LayoutRect.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Element;
 class IntersectionObserver;
 class Node;
 
+// TODO(oilpan): Switch to GarbageCollected<> after oilpan ships.
 class IntersectionObservation : public GarbageCollectedFinalized<IntersectionObservation> {
 public:
     IntersectionObservation(IntersectionObserver&, Element&, bool shouldReportRootBounds);
 
     struct IntersectionGeometry {
         LayoutRect targetRect;
         LayoutRect intersectionRect;
         LayoutRect rootRect;
     };
 
@@ skipping 24 matching lines @@
     WeakPtrWillBeWeakMember<Node> m_target;
 
     unsigned m_active : 1;
     unsigned m_shouldReportRootBounds : 1;
     unsigned m_lastThresholdIndex : 30;
 };
 
 } // namespace blink
 
 #endif // IntersectionObservation_h