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

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

Index: third_party/WebKit/Source/core/dom/ElementIntersectionObserverData.h
diff --git a/third_party/WebKit/Source/core/dom/ElementIntersectionObserverData.h b/third_party/WebKit/Source/core/dom/ElementIntersectionObserverData.h
deleted file mode 100644
index b416f365ac5717580f3e2b65715e098fef4a4f0d..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/dom/ElementIntersectionObserverData.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 ElementIntersectionObserverData_h
-#define ElementIntersectionObserverData_h
-
-#include "platform/heap/Handle.h"
-
-namespace blink {
-
-class Element;
-class IntersectionObservation;
-class IntersectionObserver;
-
-class ElementIntersectionObserverData : public GarbageCollectedFinalized<ElementIntersectionObserverData> {
-public:
-    DECLARE_TRACE();
-    ElementIntersectionObserverData();
-    ~ElementIntersectionObserverData();
-
-    bool hasIntersectionObserver() const;
-    bool hasIntersectionObservation() const;
-    IntersectionObservation* getObservationFor(IntersectionObserver&);
-    void addObservation(IntersectionObservation&);
-    void removeObservation(IntersectionObserver&);
-    void activateValidIntersectionObservers(Element&);
-    void deactivateAllIntersectionObservers(Element&);
-
-#if !ENABLE(OILPAN)
-    void dispose();
-#endif
-
-    WeakPtrWillBeRawPtr<Element> createWeakPtr(Element*);
-
-private:
-    // IntersectionObservers for which the Element owning this data is root.
-    HeapHashSet<WeakMember<IntersectionObserver>> m_intersectionObservers;
-    // IntersectionObservations for which the Element owning this data is target.
-    HeapHashMap<Member<IntersectionObserver>, Member<IntersectionObservation>> m_intersectionObservations;
-
-#if !ENABLE(OILPAN)
-    OwnPtr<WeakPtrFactory<Element>> m_weakPointerFactory;
-#endif
-};
-
-} // namespace blink
-
-#endif // ElementIntersectionObserverData_h