HTMLImportsController does not need to hold Document ptr.

Source/core/fetch/ResourceFetcher.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
     Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 
     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 244 matching lines @@
 {
     KURL url = MemoryCache::removeFragmentIdentifierIfNeeded(resourceURL);
     return m_documentResources.get(url).get();
 }
 
 LocalFrame* ResourceFetcher::frame() const
 {
     if (m_documentLoader)
         return m_documentLoader->frame();
     if (m_document && m_document->importsController())
-        return m_document->importsController()->frame();
+        return m_document->importsController()->master()->frame();
     return 0;
 }
 
 FetchContext& ResourceFetcher::context() const
 {
     if (LocalFrame* frame = this->frame())
         return frame->fetchContext();
     return FetchContext::nullInstance();
 }
 
@@ skipping 1187 matching lines @@
     }
 }
 
 void ResourceFetcher::trace(Visitor* visitor)
 {
     visitor->trace(m_document);
     ResourceLoaderHost::trace(visitor);
 }
 
 }