Annotate ScriptWrappable-embedding singletons.

third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. 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 22 matching lines @@
 #include "core/loader/FrameLoadRequest.h"
 #include "core/loader/FrameLoader.h"
 #include "core/loader/FrameLoaderClient.h"
 #include "core/plugins/PluginView.h"
 #include "platform/weborigin/SecurityOrigin.h"
 
 namespace blink {
 
 typedef HeapHashMap<Member<Widget>, Member<FrameView>> WidgetToParentMap;
 static WidgetToParentMap& widgetNewParentMap() {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(WidgetToParentMap, map, (new WidgetToParentMap));
   return map;
 }
 
 using WidgetSet = HeapHashSet<Member<Widget>>;
 static WidgetSet& widgetsPendingTemporaryRemovalFromParent() {
   // Widgets in this set will not leak because it will be cleared in
   // HTMLFrameOwnerElement::UpdateSuspendScope::performDeferredWidgetTreeOperations.
   DEFINE_STATIC_LOCAL(WidgetSet, set, (new WidgetSet));
   return set;
@@ skipping 269 matching lines @@
 }
 
 DEFINE_TRACE(HTMLFrameOwnerElement) {
   visitor->trace(m_contentFrame);
   visitor->trace(m_widget);
   HTMLElement::trace(visitor);
   FrameOwner::trace(visitor);
 }
 
 }  // namespace blink