[HTML Imports] Let script of imported document running.

Source/core/dom/DocumentInit.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 19 matching lines @@
 
 #include "RuntimeEnabledFeatures.h"
 #include "core/dom/Document.h"
 #include "core/html/HTMLImportsController.h"
 #include "core/page/Frame.h"
 
 namespace WebCore {
 
 bool DocumentInit::shouldSetURL() const
 {
-    return (m_frame && m_frame->ownerElement()) || !m_url.isEmpty();
+    Frame* frame = frameForSecurityContext();
+    return (frame && frame->ownerElement()) || !m_url.isEmpty();
 }
 
 bool DocumentInit::shouldTreatURLAsSrcdocDocument() const
 {
     ASSERT(m_frame);
     return m_frame->loader()->shouldTreatURLAsSrcdocDocument(m_url);
 }
 
 Frame* DocumentInit::frameForSecurityContext() const
 {
@@ skipping 43 matching lines @@
         return 0;
 
     if (m_registrationContext)
         return m_registrationContext.get();
 
     return CustomElementRegistrationContext::create();
 }
 
 } // namespace WebCore