Annotate ScriptWrappable-embedding singletons.

third_party/WebKit/Source/core/dom/shadow/ShadowRoot.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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 261 matching lines @@
   invalidateDescendantInsertionPoints();
 }
 
 void ShadowRoot::invalidateDescendantInsertionPoints() {
   m_descendantInsertionPointsIsValid = false;
   m_shadowRootRareDataV0->clearDescendantInsertionPoints();
 }
 
 const HeapVector<Member<InsertionPoint>>&
 ShadowRoot::descendantInsertionPoints() {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(HeapVector<Member<InsertionPoint>>, emptyList,
                       (new HeapVector<Member<InsertionPoint>>));
   if (m_shadowRootRareDataV0 && m_descendantInsertionPointsIsValid)
     return m_shadowRootRareDataV0->descendantInsertionPoints();
 
   m_descendantInsertionPointsIsValid = true;
 
   if (!containsInsertionPoints())
     return emptyList;
 
@@ skipping 42 matching lines @@
       ostream << "ShadowRootType::Open";
       break;
     case ShadowRootType::Closed:
       ostream << "ShadowRootType::Closed";
       break;
   }
   return ostream;
 }
 
 }  // namespace blink