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

third_party/WebKit/Source/core/svg/SVGStyleElement.cpp

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * 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.
@@ skipping 13 matching lines @@
 
 #include "core/MediaTypeNames.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/events/Event.h"
 #include "wtf/StdLibExtras.h"
 
 namespace blink {
 
 static SVGStyleEventSender& styleErrorEventSender()
 {
-    DEFINE_STATIC_LOCAL(Persistent<SVGStyleEventSender>, sharedErrorEventSender, (SVGStyleEventSender::create(EventTypeNames::error)));
-    return *sharedErrorEventSender;
+    DEFINE_STATIC_LOCAL(SVGStyleEventSender, sharedErrorEventSender, (SVGStyleEventSender::create(EventTypeNames::error)));
+    return sharedErrorEventSender;
 }
 
 inline SVGStyleElement::SVGStyleElement(Document& document, bool createdByParser)
     : SVGElement(SVGNames::styleTag, document)
     , StyleElement(&document, createdByParser)
 {
 }
 
 SVGStyleElement::~SVGStyleElement()
 {
@@ skipping 114 matching lines @@
     dispatchEvent(Event::create(EventTypeNames::error));
 }
 
 DEFINE_TRACE(SVGStyleElement)
 {
     StyleElement::trace(visitor);
     SVGElement::trace(visitor);
 }
 
 } // namespace blink