Remove some dead code from rendering/ folder

Source/core/rendering/RenderListItem.cpp

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  *
  * 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 423 matching lines @@
     RenderBlockFlow::paint(paintInfo, paintOffset);
 }
 
 const String& RenderListItem::markerText() const
 {
     if (m_marker)
         return m_marker->text();
     return nullAtom.string();
 }
 
-String RenderListItem::markerTextWithSuffix() const
-{
-    if (!m_marker)
-        return String();
-
-    // Append the suffix for the marker in the right place depending
-    // on the direction of the text (right-to-left or left-to-right).
-
-    const String& markerText = m_marker->text();
-    const String markerSuffix = m_marker->suffix();
-    StringBuilder result;
-
-    if (!m_marker->style()->isLeftToRightDirection())
-        result.append(markerSuffix);
-
-    result.append(markerText);
-
-    if (m_marker->style()->isLeftToRightDirection())
-        result.append(markerSuffix);
-
-    return result.toString();
-}
-
 void RenderListItem::explicitValueChanged()
 {
     if (m_marker)
         m_marker->setNeedsLayoutAndPrefWidthsRecalc();
     Node* listNode = enclosingList(this);
     for (RenderListItem* item = this; item; item = nextListItem(listNode, item))
         item->updateValue();
 }
 
 void RenderListItem::setExplicitValue(int value)
@@ skipping 49 matching lines @@
             // assume that all the following ones have too.
             // This gives us the opportunity to stop here and avoid
             // marking the same nodes again.
             break;
         }
         item->updateValue();
     }
 }
 
 } // namespace WebCore