Annotate ScriptWrappable-embedding singletons.

third_party/WebKit/Source/core/dom/ChildListMutationScope.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 28 matching lines @@
 namespace blink {
 
 // The accumulator map is used to make sure that there is only one mutation
 // accumulator for a given node even if there are multiple
 // ChildListMutationScopes on the stack. The map is always empty when there are
 // no ChildListMutationScopes on the stack.
 typedef HeapHashMap<Member<Node>, Member<ChildListMutationAccumulator>>
     AccumulatorMap;
 
 static AccumulatorMap& accumulatorMap() {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(AccumulatorMap, map, (new AccumulatorMap));
   return map;
 }
 
 ChildListMutationAccumulator::ChildListMutationAccumulator(
     Node* target,
     MutationObserverInterestGroup* observers)
     : m_target(target),
       m_lastAdded(nullptr),
       m_observers(observers),
@@ skipping 94 matching lines @@
   visitor->trace(m_target);
   visitor->trace(m_removedNodes);
   visitor->trace(m_addedNodes);
   visitor->trace(m_previousSibling);
   visitor->trace(m_nextSibling);
   visitor->trace(m_lastAdded);
   visitor->trace(m_observers);
 }
 
 }  // namespace blink