Use RefPtr for MutationObserver in MutationObserverInterestGroup.

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

Index: third_party/WebKit/Source/core/dom/Node.cpp
diff --git a/third_party/WebKit/Source/core/dom/Node.cpp b/third_party/WebKit/Source/core/dom/Node.cpp
index 733b79723f041c4bad898826ea6532e761dc2dbc..199fcb34c7da5e342ca2602aa9a4873836809291 100644
--- a/third_party/WebKit/Source/core/dom/Node.cpp
+++ b/third_party/WebKit/Source/core/dom/Node.cpp
@@ -1856,7 +1856,7 @@ WillBeHeapHashSet<RawPtrWillBeMember<MutationObserverRegistration>>* Node::trans
 }
 
 template<typename Registry>
-static inline void collectMatchingObserversForMutation(WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>& observers, Registry* registry, Node& target, MutationObserver::MutationType type, const QualifiedName* attributeName)
+static inline void collectMatchingObserversForMutation(WillBeHeapHashMap<RefPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>& observers, Registry* registry, Node& target, MutationObserver::MutationType type, const QualifiedName* attributeName)
 {
     if (!registry)
         return;
@@ -1864,14 +1864,14 @@ static inline void collectMatchingObserversForMutation(WillBeHeapHashMap<RawPtrW
     for (const auto& registration : *registry) {
         if (registration->shouldReceiveMutationFrom(target, type, attributeName)) {
             MutationRecordDeliveryOptions deliveryOptions = registration->deliveryOptions();
-            WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>::AddResult result = observers.add(&registration->observer(), deliveryOptions);
+            WillBeHeapHashMap<RefPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>::AddResult result = observers.add(&registration->observer(), deliveryOptions);
             if (!result.isNewEntry)
                 result.storedValue->value |= deliveryOptions;
         }
     }
 }
 
-void Node::getRegisteredMutationObserversOfType(WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>& observers, MutationObserver::MutationType type, const QualifiedName* attributeName)
+void Node::getRegisteredMutationObserversOfType(WillBeHeapHashMap<RefPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>& observers, MutationObserver::MutationType type, const QualifiedName* attributeName)
 {
     ASSERT((type == MutationObserver::Attributes && attributeName) || !attributeName);
     collectMatchingObserversForMutation(observers, mutationObserverRegistry(), *this, type, attributeName);