Adjust FrameFetchContext clearing logic when clearing HTMLImportsController

Source/core/dom/Document.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, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 802 matching lines @@
 {
     if (!m_customElementMicrotaskRunQueue)
         m_customElementMicrotaskRunQueue = CustomElementMicrotaskRunQueue::create();
     return m_customElementMicrotaskRunQueue.get();
 }
 
 void Document::setImportsController(HTMLImportsController* controller)
 {
     ASSERT(!m_importsController || !controller);
     m_importsController = controller;
-    if (!m_importsController)
+    if (!m_importsController && !loader())
         m_fetcher->clearContext();
 }
 
 HTMLImportLoader* Document::importLoader() const
 {
     if (!m_importsController)
         return 0;
     return m_importsController->loaderFor(*this);
 }
 
@@ skipping 4853 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif