Annotate ScriptWrappable-embedding singletons.

third_party/WebKit/Source/core/dom/MutationObserver.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 149 matching lines @@
   m_registrations.insert(registration);
 }
 
 void MutationObserver::observationEnded(
     MutationObserverRegistration* registration) {
   DCHECK(m_registrations.contains(registration));
   m_registrations.remove(registration);
 }
 
 static MutationObserverSet& activeMutationObservers() {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(MutationObserverSet, activeObservers,
                       (new MutationObserverSet));
   return activeObservers;
 }
 
 using SlotChangeList = HeapVector<Member<HTMLSlotElement>>;
 
 // TODO(hayato): We should have a SlotChangeList for each unit of related
 // similar-origin browsing context.
 // https://html.spec.whatwg.org/multipage/browsers.html#unit-of-related-similar-origin-browsing-contexts
 static SlotChangeList& activeSlotChangeList() {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(SlotChangeList, slotChangeList, (new SlotChangeList));
   return slotChangeList;
 }
 
 static MutationObserverSet& suspendedMutationObservers() {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(MutationObserverSet, suspendedObservers,
                       (new MutationObserverSet));
   return suspendedObservers;
 }
 
 static void ensureEnqueueMicrotask() {
   if (activeMutationObservers().isEmpty() && activeSlotChangeList().isEmpty())
     Microtask::enqueueMicrotask(WTF::bind(&MutationObserver::deliverMutations));
 }
 
@@ skipping 116 matching lines @@
 }
 
 DEFINE_TRACE(MutationObserver) {
   visitor->trace(m_callback);
   visitor->trace(m_records);
   visitor->trace(m_registrations);
   visitor->trace(m_callback);
 }
 
 }  // namespace blink