Annotate ScriptWrappable-embedding singletons.

third_party/WebKit/Source/core/frame/Frame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
@@ skipping 106 matching lines @@
 
   return tree().parent()->isRemoteFrame();
 }
 
 HTMLFrameOwnerElement* Frame::deprecatedLocalOwner() const {
   return m_owner && m_owner->isLocal() ? toHTMLFrameOwnerElement(m_owner)
                                        : nullptr;
 }
 
 static ChromeClient& emptyChromeClient() {
+  ALLOW_UNSAFE_SINGLETON()
   DEFINE_STATIC_LOCAL(EmptyChromeClient, client, (EmptyChromeClient::create()));
   return client;
 }
 
 ChromeClient& Frame::chromeClient() const {
   if (Page* page = this->page())
     return page->chromeClient();
   return emptyChromeClient();
 }
 
@@ skipping 278 matching lines @@
 
   ASSERT(page());
 
   if (m_owner)
     m_owner->setContentFrame(*this);
   else
     page()->setMainFrame(this);
 }
 
 }  // namespace blink