Annotate ScriptWrappable-embedding singletons.

third_party/WebKit/Source/core/dom/TreeScope.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple 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 105 matching lines @@
 Element* TreeScope::getElementById(const AtomicString& elementId) const {
   if (elementId.isEmpty())
     return nullptr;
   if (!m_elementsById)
     return nullptr;
   return m_elementsById->getElementById(elementId, this);
 }
 
 const HeapVector<Member<Element>>& TreeScope::getAllElementsById(
     const AtomicString& elementId) const {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(HeapVector<Member<Element>>, emptyVector,
                       (new HeapVector<Member<Element>>));
   if (elementId.isEmpty())
     return emptyVector;
   if (!m_elementsById)
     return emptyVector;
   return m_elementsById->getAllElementsById(elementId, this);
 }
 
 void TreeScope::addElementById(const AtomicString& elementId,
@@ skipping 393 matching lines @@
   visitor->trace(m_idTargetObserverRegistry);
   visitor->trace(m_selection);
   visitor->trace(m_elementsById);
   visitor->trace(m_imageMapsByName);
   visitor->trace(m_scopedStyleResolver);
   visitor->trace(m_radioButtonGroupScope);
   visitor->trace(m_svgTreeScopedResources);
 }
 
 }  // namespace blink