Use RefPtr for MutationObserver in MutationObserverInterestGroup.

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

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 
 #include "core/dom/MutationObserverInterestGroup.h"
 
 #include "core/dom/MutationRecord.h"
 
 namespace blink {
 
 PassOwnPtrWillBeRawPtr<MutationObserverInterestGroup> MutationObserverInterestGroup::createIfNeeded(Node& target, MutationObserver::MutationType type, MutationRecordDeliveryOptions oldValueFlag, const QualifiedName* attributeName)
 {
     ASSERT((type == MutationObserver::Attributes && attributeName) || !attributeName);
-    WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions> observers;
+    WillBeHeapHashMap<RefPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions> observers;
     target.getRegisteredMutationObserversOfType(observers, type, attributeName);
     if (observers.isEmpty())
         return nullptr;
 
     return adoptPtrWillBeNoop(new MutationObserverInterestGroup(observers, oldValueFlag));
 }
 
-MutationObserverInterestGroup::MutationObserverInterestGroup(WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>& observers, MutationRecordDeliveryOptions oldValueFlag)
+MutationObserverInterestGroup::MutationObserverInterestGroup(WillBeHeapHashMap<RefPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>& observers, MutationRecordDeliveryOptions oldValueFlag)
     : m_oldValueFlag(oldValueFlag)
 {
     ASSERT(!observers.isEmpty());
     m_observers.swap(observers);
 }
 
 bool MutationObserverInterestGroup::isOldValueRequested()
 {
     for (auto& observer : m_observers) {
         if (hasOldValue(observer.value))
             return true;
     }
     return false;
 }
 
 void MutationObserverInterestGroup::enqueueMutationRecord(PassRefPtrWillBeRawPtr<MutationRecord> prpMutation)
 {
     RefPtrWillBeRawPtr<MutationRecord> mutation = prpMutation;
     RefPtrWillBeRawPtr<MutationRecord> mutationWithNullOldValue = nullptr;
     for (auto& iter : m_observers) {
-        MutationObserver* observer = iter.key;
+        MutationObserver* observer = iter.key.get();
         if (hasOldValue(iter.value)) {
             observer->enqueueMutationRecord(mutation);
             continue;
         }
         if (!mutationWithNullOldValue) {
             if (mutation->oldValue().isNull())
                 mutationWithNullOldValue = mutation;
             else
                 mutationWithNullOldValue = MutationRecord::createWithNullOldValue(mutation).get();
         }
         observer->enqueueMutationRecord(mutationWithNullOldValue);
     }
 }
 
 DEFINE_TRACE(MutationObserverInterestGroup)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_observers);
 #endif
 }
 
 } // namespace blink