Annotate ScriptWrappable-embedding singletons.

third_party/WebKit/Source/core/dom/custom/V0CustomElementObserver.cpp

 /*
  * Copyright (C) 2013 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 22 matching lines @@
 #include "core/dom/Element.h"
 
 namespace blink {
 
 // Maps elements to the observer watching them. At most one per
 // element at a time.
 typedef HeapHashMap<WeakMember<Element>, Member<V0CustomElementObserver>>
     ElementObserverMap;
 
 static ElementObserverMap& elementObservers() {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(ElementObserverMap, map, (new ElementObserverMap));
   return map;
 }
 
 void V0CustomElementObserver::notifyElementWasDestroyed(Element* element) {
   ElementObserverMap::iterator it = elementObservers().find(element);
   if (it == elementObservers().end())
     return;
   it->value->elementWasDestroyed(element);
 }
 
 void V0CustomElementObserver::observe(Element* element) {
   ElementObserverMap::AddResult result =
       elementObservers().insert(element, this);
   DCHECK(result.isNewEntry);
 }
 
 void V0CustomElementObserver::unobserve(Element* element) {
   V0CustomElementObserver* observer = elementObservers().take(element);
   DCHECK_EQ(observer, this);
 }
 
 }  // namespace blink