Annotate ScriptWrappable-embedding singletons.

third_party/WebKit/Source/core/svg/SVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann
  * <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 613 matching lines @@
   if (!hasSVGRareData())
     return;
 
   HeapHashSet<WeakMember<SVGElement>>& instances =
       svgRareData()->elementInstances();
 
   instances.remove(instance);
 }
 
 static HeapHashSet<WeakMember<SVGElement>>& emptyInstances() {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(HeapHashSet<WeakMember<SVGElement>>, emptyInstances,
                       (new HeapHashSet<WeakMember<SVGElement>>));
   return emptyInstances;
 }
 
 const HeapHashSet<WeakMember<SVGElement>>& SVGElement::instancesForElement()
     const {
   if (!hasSVGRareData())
     return emptyInstances();
   return svgRareData()->elementInstances();
@@ skipping 656 matching lines @@
   visitor->trace(m_className);
   Element::trace(visitor);
 }
 
 const AtomicString& SVGElement::eventParameterName() {
   DEFINE_STATIC_LOCAL(const AtomicString, evtString, ("evt"));
   return evtString;
 }
 
 }  // namespace blink