Empty inline elements always get a line box.

Source/core/rendering/line/BreakingContext.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated.
  *
  * 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 30 matching lines @@
     }
 
     // FIXME Bug 100049: We do not need to consume input in a multi-segment line
     // unless no segment will.
     if (m_lineBreak == m_resolver.position())
         m_lineBreak.increment();
 
     // Sanity check our midpoints.
     m_lineMidpointState.checkMidpoints(m_lineBreak);
 
-    m_trailingObjects.updateMidpointsForTrailingBoxes(m_lineMidpointState, m_lineBreak, TrailingObjects::CollapseFirstSpace);
+    m_trailingObjects.updateMidpointsForTrailingObjects(m_lineMidpointState, m_lineBreak, TrailingObjects::CollapseFirstSpace);
 
     // We might have made lineBreak an iterator that points past the end
     // of the object. Do this adjustment to make it point to the start
     // of the next object instead to avoid confusing the rest of the
     // code.
     if (m_lineBreak.offset()) {
         // This loop enforces the invariant that line breaks should never point
         // at an empty inline. See http://crbug.com/305904.
         do {
             m_lineBreak.setOffset(m_lineBreak.offset() - 1);
             m_lineBreak.increment();
         } while (!m_lineBreak.atEnd() && isEmptyInline(m_lineBreak.object()));
     }
 
     return m_lineBreak;
 }
 
 }