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

third_party/WebKit/Source/core/loader/ImageLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010 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.
  *
@@ skipping 36 matching lines @@
 #include "core/svg/graphics/SVGImage.h"
 #include "platform/Logging.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "platform/weborigin/SecurityPolicy.h"
 #include "public/platform/WebURLRequest.h"
 
 namespace blink {
 
 static ImageEventSender& loadEventSender()
 {
-    DEFINE_STATIC_LOCAL(Persistent<ImageEventSender>, sender, (ImageEventSender::create(EventTypeNames::load)));
-    return *sender;
+    DEFINE_STATIC_LOCAL(ImageEventSender, sender, (ImageEventSender::create(EventTypeNames::load)));
+    return sender;
 }
 
 static ImageEventSender& errorEventSender()
 {
-    DEFINE_STATIC_LOCAL(Persistent<ImageEventSender>, sender, (ImageEventSender::create(EventTypeNames::error)));
-    return *sender;
+    DEFINE_STATIC_LOCAL(ImageEventSender, sender, (ImageEventSender::create(EventTypeNames::error)));
+    return sender;
 }
 
 static inline bool pageIsBeingDismissed(Document* document)
 {
     return document->pageDismissalEventBeingDispatched() != Document::NoDismissal;
 }
 
 static ImageLoader::BypassMainWorldBehavior shouldBypassMainWorldCSP(ImageLoader* loader)
 {
     ASSERT(loader);
@@ skipping 561 matching lines @@
 
 void ImageLoader::elementDidMoveToNewDocument()
 {
     if (m_loadDelayCounter)
         m_loadDelayCounter->documentChanged(m_element->document());
     clearFailedLoadURL();
     setImage(0);
 }
 
 } // namespace blink