Remove some dead code from rendering/ folder

Source/core/rendering/RenderRubyBase.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 112 matching lines @@
         RenderBlock* anonBlockHere = toRenderBlock(firstChildHere);
         RenderBlock* anonBlockThere = toRenderBlock(lastChildThere);
         anonBlockHere->moveAllChildrenTo(anonBlockThere, anonBlockThere->children());
         anonBlockHere->deleteLineBoxTree();
         anonBlockHere->destroy();
     }
     // Move all remaining children normally.
     moveChildrenTo(toBase, firstChild(), beforeChild);
 }
 
-RenderRubyRun* RenderRubyBase::rubyRun() const
-{
-    ASSERT(parent());
-    ASSERT(parent()->isRubyRun());
-
-    return toRenderRubyRun(parent());
-}
-
 ETextAlign RenderRubyBase::textAlignmentForLine(bool /* endsWithSoftBreak */) const
 {
     return JUSTIFY;
 }
 
 void RenderRubyBase::adjustInlineDirectionLineBounds(int expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
 {
     int maxPreferredLogicalWidth = this->maxPreferredLogicalWidth();
     if (maxPreferredLogicalWidth >= logicalWidth)
         return;
 
     // Inset the ruby base by half the inter-ideograph expansion amount.
     float inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
 
     logicalLeft += inset / 2;
     logicalWidth -= inset;
 }
 
 } // namespace WebCore