Annotate ScriptWrappable-embedding singletons.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc.
  * All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
@@ skipping 142 matching lines @@
 namespace {
 
 // We need to retain the scroll customization callbacks until the element
 // they're associated with is destroyed. It would be simplest if the callbacks
 // could be stored in ElementRareData, but we can't afford the space
 // increase. Instead, keep the scroll customization callbacks here. The other
 // option would be to store these callbacks on the FrameHost or document, but
 // that necessitates a bunch more logic for transferring the callbacks between
 // FrameHosts when elements are moved around.
 ScrollCustomizationCallbacks& scrollCustomizationCallbacks() {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(ScrollCustomizationCallbacks,
                       scrollCustomizationCallbacks,
                       (new ScrollCustomizationCallbacks));
   return scrollCustomizationCallbacks;
 }
 
 }  // namespace
 
 using namespace HTMLNames;
 using namespace XMLNames;
@@ skipping 3961 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(Element) {
   if (hasRareData()) {
     visitor->traceWrappers(elementRareData());
   }
   ContainerNode::traceWrappers(visitor);
 }
 
 }  // namespace blink