Have ChildFrameDisconnector / ChildListMutationScope deal with references

Source/core/dom/ChildListMutationScope.cpp

Index: Source/core/dom/ChildListMutationScope.cpp
diff --git a/Source/core/dom/ChildListMutationScope.cpp b/Source/core/dom/ChildListMutationScope.cpp
index 6acb5b1ba68d2bc664f551baf703a74d461aeec3..47e296e37f76837c2286393381ede3e9520f8eb1 100644
--- a/Source/core/dom/ChildListMutationScope.cpp
+++ b/Source/core/dom/ChildListMutationScope.cpp
@@ -62,14 +62,14 @@ ChildListMutationAccumulator::~ChildListMutationAccumulator()
     accumulatorMap().remove(m_target.get());
 }
 
-PassRefPtr<ChildListMutationAccumulator> ChildListMutationAccumulator::getOrCreate(Node* target)
+PassRefPtr<ChildListMutationAccumulator> ChildListMutationAccumulator::getOrCreate(Node& target)
 {
-    AccumulatorMap::AddResult result = accumulatorMap().add(target, 0);
+    AccumulatorMap::AddResult result = accumulatorMap().add(&target, 0);
     RefPtr<ChildListMutationAccumulator> accumulator;
     if (!result.isNewEntry)
         accumulator = result.iterator->value;
     else {
-        accumulator = adoptRef(new ChildListMutationAccumulator(target, MutationObserverInterestGroup::createForChildListMutation(target)));
+        accumulator = adoptRef(new ChildListMutationAccumulator(PassRefPtr<Node>(target), MutationObserverInterestGroup::createForChildListMutation(target)));
         result.iterator->value = accumulator.get();
     }
     return accumulator.release();