Simplify ownership handling of HTMLImportsController.

third_party/WebKit/Source/core/dom/Document.h

 /*
  * 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) 2011 Google Inc. All rights reserved.
  *
@@ skipping 1151 matching lines @@
     bool m_hasNodesWithPlaceholderStyle;
     bool m_evaluateMediaQueriesOnStyleRecalc;
 
     // If we do ignore the pending stylesheet count, then we need to add a boolean
     // to track that this happened so that we can do a full repaint when the stylesheets
     // do eventually load.
     PendingSheetLayout m_pendingSheetLayout;
 
     Member<LocalFrame> m_frame;
     Member<LocalDOMWindow> m_domWindow;
-    // TODO(Oilpan): when we get rid of the transition types change the
-    // HTMLImportsController to not be a DocumentSupplement since it is
-    // redundant with oilpan.
     Member<HTMLImportsController> m_importsController;
 
     Member<ResourceFetcher> m_fetcher;
     Member<DocumentParser> m_parser;
     Member<ContextFeatures> m_contextFeatures;
 
     bool m_wellFormed;
 
     // Document URLs.
     KURL m_url; // Document.URL: The URL from which this document was retrieved.
@@ skipping 245 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h