IntersectionObserver: use nullptr for implicit root.

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

 /*
  * Copyright (C) 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Smith <catfish.man@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 10 matching lines @@
 
 #ifndef ElementRareData_h
 #define ElementRareData_h
 
 #include "bindings/core/v8/ScriptWrappableVisitor.h"
 #include "core/animation/ElementAnimations.h"
 #include "core/css/cssom/InlineStylePropertyMap.h"
 #include "core/dom/Attr.h"
 #include "core/dom/CompositorProxiedPropertySet.h"
 #include "core/dom/DatasetDOMStringMap.h"
+#include "core/dom/ElementIntersectionObserverData.h"
 #include "core/dom/NamedNodeMap.h"
-#include "core/dom/NodeIntersectionObserverData.h"
 #include "core/dom/NodeRareData.h"
 #include "core/dom/PseudoElement.h"
 #include "core/dom/PseudoElementData.h"
 #include "core/dom/custom/CustomElementDefinition.h"
 #include "core/dom/custom/V0CustomElementDefinition.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/html/ClassList.h"
 #include "platform/heap/Handle.h"
 #include "wtf/HashSet.h"
 #include <memory>
@@ skipping 111 matching lines @@
   }
 
   AttrNodeList& ensureAttrNodeList();
   AttrNodeList* attrNodeList() { return m_attrNodeList.get(); }
   void removeAttrNodeList() { m_attrNodeList.clear(); }
   void addAttr(Attr* attr) {
     ensureAttrNodeList().append(attr);
     ScriptWrappableVisitor::writeBarrier(this, attr);
   }
 
-  NodeIntersectionObserverData* intersectionObserverData() const {
+  ElementIntersectionObserverData* intersectionObserverData() const {
     return m_intersectionObserverData.get();
   }
-  NodeIntersectionObserverData& ensureIntersectionObserverData() {
+  ElementIntersectionObserverData& ensureIntersectionObserverData() {
     if (!m_intersectionObserverData) {
-      m_intersectionObserverData = new NodeIntersectionObserverData();
+      m_intersectionObserverData = new ElementIntersectionObserverData();
       ScriptWrappableVisitor::writeBarrier(this, m_intersectionObserverData);
     }
     return *m_intersectionObserverData;
   }
 
   using ResizeObserverDataMap =
       HeapHashMap<Member<ResizeObserver>, Member<ResizeObservation>>;
 
   ResizeObserverDataMap* resizeObserverData() const {
     return m_resizeObserverData;
@@ skipping 13 matching lines @@
   Member<DatasetDOMStringMap> m_dataset;
   Member<ElementShadow> m_shadow;
   Member<ClassList> m_classList;
   Member<NamedNodeMap> m_attributeMap;
   Member<AttrNodeList> m_attrNodeList;
   Member<InlineCSSStyleDeclaration> m_cssomWrapper;
   Member<InlineStylePropertyMap> m_cssomMapWrapper;
   std::unique_ptr<CompositorProxiedPropertySet> m_proxiedProperties;
 
   Member<ElementAnimations> m_elementAnimations;
-  Member<NodeIntersectionObserverData> m_intersectionObserverData;
+  Member<ElementIntersectionObserverData> m_intersectionObserverData;
   Member<ResizeObserverDataMap> m_resizeObserverData;
 
   RefPtr<ComputedStyle> m_computedStyle;
   // TODO(davaajav):remove this field when v0 custom elements are deprecated
   Member<V0CustomElementDefinition> m_v0CustomElementDefinition;
   Member<CustomElementDefinition> m_customElementDefinition;
 
   Member<PseudoElementData> m_pseudoElementData;
 
   explicit ElementRareData(LayoutObject*);
@@ skipping 53 matching lines @@
 inline CompositorProxiedPropertySet&
 ElementRareData::ensureCompositorProxiedPropertySet() {
   if (!m_proxiedProperties)
     m_proxiedProperties = CompositorProxiedPropertySet::create();
   return *m_proxiedProperties;
 }
 
 }  // namespace blink
 
 #endif  // ElementRareData_h