Completely detach failed script loader before dispatching error event.

third_party/WebKit/Source/core/dom/ScriptLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * 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
@@ skipping 446 matching lines @@
         else
             dispatchErrorEvent();
     }
     m_resource = nullptr;
 }
 
 void ScriptLoader::notifyFinished(Resource* resource)
 {
     DCHECK(!m_willBeParserExecuted);
 
-    Document* elementDocument = &(m_element->document());
-    Document* contextDocument = elementDocument->contextDocument();
+    Document* contextDocument = m_element->document().contextDocument();
     if (!contextDocument)
         return;
 
     ASSERT_UNUSED(resource, resource == m_resource);
 
     ScriptRunner::ExecutionType runOrder = m_willExecuteInOrder ? ScriptRunner::IN_ORDER_EXECUTION : ScriptRunner::ASYNC_EXECUTION;
     if (m_resource->errorOccurred()) {
         contextDocument->scriptRunner()->notifyScriptLoadError(this, runOrder);
+        detach();
         dispatchErrorEvent();
-        detach();
         return;
     }
     contextDocument->scriptRunner()->notifyScriptReady(this, runOrder);
     m_pendingScript->stopWatchingForLoad();
 }
 
 bool ScriptLoader::ignoresLoadRequest() const
 {
     return m_alreadyStarted || m_isExternalScript || m_parserInserted || !element() || !element()->inShadowIncludingDocument();
 }
@@ skipping 34 matching lines @@
     if (isHTMLScriptLoader(element))
         return toHTMLScriptElement(element)->loader();
 
     if (isSVGScriptLoader(element))
         return toSVGScriptElement(element)->loader();
 
     return 0;
 }
 
 } // namespace blink