IntersectionObserver: use nullptr for implicit root.

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 75 matching lines @@
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContextTask.h"
 #include "core/dom/FrameRequestCallback.h"
 #include "core/dom/IntersectionObserverController.h"
 #include "core/dom/LayoutTreeBuilderTraversal.h"
 #include "core/dom/LiveNodeList.h"
 #include "core/dom/MutationObserver.h"
 #include "core/dom/NodeChildRemovalTracker.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/NodeFilter.h"
-#include "core/dom/NodeIntersectionObserverData.h"
 #include "core/dom/NodeIterator.h"
 #include "core/dom/NodeRareData.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/NodeWithIndex.h"
 #include "core/dom/NthIndexCache.h"
 #include "core/dom/ProcessingInstruction.h"
 #include "core/dom/ScriptRunner.h"
 #include "core/dom/ScriptedAnimationController.h"
 #include "core/dom/ScriptedIdleTaskController.h"
 #include "core/dom/SelectorQuery.h"
@@ skipping 5605 matching lines @@
 }
 
 IntersectionObserverController&
 Document::ensureIntersectionObserverController() {
   if (!m_intersectionObserverController)
     m_intersectionObserverController =
         IntersectionObserverController::create(this);
   return *m_intersectionObserverController;
 }
 
-NodeIntersectionObserverData& Document::ensureIntersectionObserverData() {
-  if (!m_intersectionObserverData)
-    m_intersectionObserverData = new NodeIntersectionObserverData();
-  return *m_intersectionObserverData;
-}
-
 ResizeObserverController& Document::ensureResizeObserverController() {
   if (!m_resizeObserverController)
     m_resizeObserverController = new ResizeObserverController();
   return *m_resizeObserverController;
 }
 
 static void runAddConsoleMessageTask(MessageSource source,
                                      MessageLevel level,
                                      const String& message,
                                      ExecutionContext* context) {
@@ skipping 785 matching lines @@
   visitor->trace(m_timers);
   visitor->trace(m_templateDocument);
   visitor->trace(m_templateDocumentHost);
   visitor->trace(m_userActionElements);
   visitor->trace(m_svgExtensions);
   visitor->trace(m_timeline);
   visitor->trace(m_compositorPendingAnimations);
   visitor->trace(m_contextDocument);
   visitor->trace(m_canvasFontCache);
   visitor->trace(m_intersectionObserverController);
-  visitor->trace(m_intersectionObserverData);
   visitor->trace(m_snapCoordinator);
   visitor->trace(m_resizeObserverController);
   visitor->trace(m_propertyRegistry);
   visitor->trace(m_styleReattachDataMap);
   Supplementable<Document>::trace(visitor);
   TreeScope::trace(visitor);
   ContainerNode::trace(visitor);
   ExecutionContext::trace(visitor);
   SecurityContext::trace(visitor);
   SynchronousMutationNotifier::trace(visitor);
@@ skipping 46 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif