1 files changed, 14 insertions, 17 deletions

diff --git a/Source/WebCore/dom/ChildListMutationScope.cpp b/Source/WebCore/dom/ChildListMutationScope.cpp
index 2c5071649..0fee84cd7 100644
--- a/Source/WebCore/dom/ChildListMutationScope.cpp
+++ b/Source/WebCore/dom/ChildListMutationScope.cpp
@@ -29,13 +29,12 @@
  */
 
 #include "config.h"
-
 #include "ChildListMutationScope.h"
 
-#include "DocumentFragment.h"
 #include "MutationObserverInterestGroup.h"
 #include "MutationRecord.h"
 #include "StaticNodeList.h"
+#include <wtf/NeverDestroyed.h>
 #include <wtf/StdLibExtras.h>
 
 namespace WebCore {
@@ -43,14 +42,14 @@ namespace WebCore {
 typedef HashMap<ContainerNode*, ChildListMutationAccumulator*> AccumulatorMap;
 static AccumulatorMap& accumulatorMap()
 {
-    DEFINE_STATIC_LOCAL(AccumulatorMap, map, ());
+    static NeverDestroyed<AccumulatorMap> map;
     return map;
 }
 
-ChildListMutationAccumulator::ChildListMutationAccumulator(ContainerNode& target, PassOwnPtr<MutationObserverInterestGroup> observers)
+ChildListMutationAccumulator::ChildListMutationAccumulator(ContainerNode& target, std::unique_ptr<MutationObserverInterestGroup> observers)
     : m_target(target)
-    , m_lastAdded(0)
-    , m_observers(observers)
+    , m_lastAdded(nullptr)
+    , m_observers(WTFMove(observers))
 {
 }
 
@@ -58,10 +57,10 @@ ChildListMutationAccumulator::~ChildListMutationAccumulator()
 {
     if (!isEmpty())
         enqueueMutationRecord();
-    accumulatorMap().remove(&m_target.get());
+    accumulatorMap().remove(m_target.ptr());
 }
 
-PassRefPtr<ChildListMutationAccumulator> ChildListMutationAccumulator::getOrCreate(ContainerNode& target)
+RefPtr<ChildListMutationAccumulator> ChildListMutationAccumulator::getOrCreate(ContainerNode& target)
 {
     AccumulatorMap::AddResult result = accumulatorMap().add(&target, nullptr);
     RefPtr<ChildListMutationAccumulator> accumulator;
@@ -71,7 +70,7 @@ PassRefPtr<ChildListMutationAccumulator> ChildListMutationAccumulator::getOrCrea
         accumulator = adoptRef(new ChildListMutationAccumulator(target, MutationObserverInterestGroup::createForChildListMutation(target)));
         result.iterator->value = accumulator.get();
     }
-    return accumulator.release();
+    return accumulator;
 }
 
 inline bool ChildListMutationAccumulator::isAddedNodeInOrder(Node& child)
@@ -85,7 +84,7 @@ void ChildListMutationAccumulator::childAdded(Node& childRef)
 
     Ref<Node> child(childRef);
 
-    if (!isAddedNodeInOrder(child.get()))
+    if (!isAddedNodeInOrder(child))
         enqueueMutationRecord();
 
     if (isEmpty()) {
@@ -93,7 +92,7 @@ void ChildListMutationAccumulator::childAdded(Node& childRef)
         m_nextSibling = child->nextSibling();
     }
 
-    m_lastAdded = &child.get();
+    m_lastAdded = child.ptr();
     m_addedNodes.append(child.get());
 }
 
@@ -108,7 +107,7 @@ void ChildListMutationAccumulator::willRemoveChild(Node& childRef)
 
     Ref<Node> child(childRef);
 
-    if (!m_addedNodes.isEmpty() || !isRemovedNodeInOrder(child.get()))
+    if (!m_addedNodes.isEmpty() || !isRemovedNodeInOrder(child))
         enqueueMutationRecord();
 
     if (isEmpty()) {
@@ -126,11 +125,9 @@ void ChildListMutationAccumulator::enqueueMutationRecord()
     ASSERT(hasObservers());
     ASSERT(!isEmpty());
 
-    RefPtr<NodeList> addedNodes = StaticNodeList::adopt(m_addedNodes);
-    RefPtr<NodeList> removedNodes = StaticNodeList::adopt(m_removedNodes);
-    RefPtr<MutationRecord> record = MutationRecord::createChildList(m_target.get(), addedNodes.release(), removedNodes.release(), m_previousSibling.release(), m_nextSibling.release());
-    m_observers->enqueueMutationRecord(record.release());
-    m_lastAdded = 0;
+    auto record = MutationRecord::createChildList(m_target, StaticNodeList::create(WTFMove(m_addedNodes)), StaticNodeList::create(WTFMove(m_removedNodes)), WTFMove(m_previousSibling), WTFMove(m_nextSibling));
+    m_observers->enqueueMutationRecord(WTFMove(record));
+    m_lastAdded = nullptr;
     ASSERT(isEmpty());
 }