Annotate ScriptWrappable-embedding singletons.

third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceContainer.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 245 matching lines @@
   SVGElementSet* dependencies =
       toSVGElement(object->node())->setOfIncomingReferences();
   if (!dependencies)
     return;
 
   // We allow cycles in SVGDocumentExtensions reference sets in order to avoid
   // expensive reference graph adjustments on changes, so we need to break
   // possible cycles here.
   // This strong reference is safe, as it is guaranteed that this set will be
   // emptied at the end of recursion.
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(SVGElementSet, invalidatingDependencies,
                       (new SVGElementSet));
 
   for (SVGElement* element : *dependencies) {
     if (LayoutObject* layoutObject = element->layoutObject()) {
       if (UNLIKELY(!invalidatingDependencies.insert(element).isNewEntry)) {
         // Reference cycle: we are in process of invalidating this dependant.
         continue;
       }
 
@@ skipping 25 matching lines @@
       // This will process the rest of the ancestors.
       toLayoutSVGResourceContainer(current)->removeAllClientsFromCache();
       break;
     }
 
     current = current->parent();
   }
 }
 
 }  // namespace blink