HTMLImageElement: do not use fallback content for ImageDocument

third_party/WebKit/Source/core/loader/ImageLoader.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2009 Apple Inc. All rights reserved.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 67 matching lines @@
 
     Element* element() const { return m_element; }
     bool imageComplete() const
     {
         return m_imageComplete && !m_pendingTask;
     }
 
     ImageResource* image() const { return m_image.get(); }
     void setImage(ImageResource*); // Cancels pending load events, and doesn't dispatch new ones.
 
+    bool isLoadingImageDocument() { return m_loadingImageDocument; }
     void setLoadingImageDocument() { m_loadingImageDocument = true; }
 
     bool hasPendingActivity() const
     {
         return m_hasPendingLoadEvent || m_hasPendingErrorEvent || m_pendingTask;
     }
 
     bool hasPendingError() const
     {
         return m_hasPendingErrorEvent;
@@ skipping 66 matching lines @@
     bool m_hasPendingErrorEvent : 1;
     bool m_imageComplete : 1;
     bool m_loadingImageDocument : 1;
     bool m_elementIsProtected : 1;
     bool m_suppressErrorEvents : 1;
 };
 
 } // namespace blink
 
 #endif