Improve DEFINE_STATIC_LOCAL()'s handling of Blink GCed objects.

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>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 136 matching lines @@
     return tree().parent()->isRemoteFrame();
 }
 
 HTMLFrameOwnerElement* Frame::deprecatedLocalOwner() const
 {
     return m_owner && m_owner->isLocal() ? toHTMLFrameOwnerElement(m_owner) : nullptr;
 }
 
 static ChromeClient& emptyChromeClient()
 {
-    DEFINE_STATIC_LOCAL(Persistent<EmptyChromeClient>, client, (EmptyChromeClient::create()));
-    return *client;
+    DEFINE_STATIC_LOCAL(EmptyChromeClient, client, (EmptyChromeClient::create()));
+    return client;
 }
 
 ChromeClient& Frame::chromeClient() const
 {
     if (Page* page = this->page())
         return page->chromeClient();
     return emptyChromeClient();
 }
 
 Frame* Frame::findFrameForNavigation(const AtomicString& name, Frame& activeFrame)
@@ skipping 139 matching lines @@
     frameCounter().increment();
 #endif
 
     if (m_owner)
         m_owner->setContentFrame(*this);
     else
         page()->setMainFrame(this);
 }
 
 } // namespace blink