Revert of Use Document, rather than document element, for implicit root.

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

Index: third_party/WebKit/Source/core/dom/NodeIntersectionObserverData.h
diff --git a/third_party/WebKit/Source/core/dom/NodeIntersectionObserverData.h b/third_party/WebKit/Source/core/dom/NodeIntersectionObserverData.h
deleted file mode 100644
index 80faa6105470dd58ed8478bc45d6f61945e3811b..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/dom/NodeIntersectionObserverData.h
+++ /dev/null
@@ -1,49 +0,0 @@
-// 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 NodeIntersectionObserverData_h
-#define NodeIntersectionObserverData_h
-
-#include "platform/heap/Handle.h"
-
-namespace blink {
-
-class Node;
-class IntersectionObservation;
-class IntersectionObserver;
-
-class NodeIntersectionObserverData : public GarbageCollectedFinalized<NodeIntersectionObserverData> {
-public:
-    DECLARE_TRACE();
-    NodeIntersectionObserverData();
-    ~NodeIntersectionObserverData();
-
-    bool hasIntersectionObserver() const;
-    bool hasIntersectionObservation() const;
-    IntersectionObservation* getObservationFor(IntersectionObserver&);
-    void addObservation(IntersectionObservation&);
-    void removeObservation(IntersectionObserver&);
-    void activateValidIntersectionObservers(Node&);
-    void deactivateAllIntersectionObservers(Node&);
-
-#if !ENABLE(OILPAN)
-    void dispose();
-#endif
-
-    WeakPtrWillBeRawPtr<Node> createWeakPtr(Node*);
-
-private:
-    // IntersectionObservers for which the Node owning this data is root.
-    HeapHashSet<WeakMember<IntersectionObserver>> m_intersectionObservers;
-    // IntersectionObservations for which the Node owning this data is target.
-    HeapHashMap<Member<IntersectionObserver>, Member<IntersectionObservation>> m_intersectionObservations;
-
-#if !ENABLE(OILPAN)
-    OwnPtr<WeakPtrFactory<Node>> m_weakPointerFactory;
-#endif
-};
-
-} // namespace blink
-
-#endif // NodeIntersectionObserverData_h