Replace compile flag with runtime check for text-underline-position

Source/core/rendering/RootInlineBox.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 163 matching lines @@
     }
     LayoutUnit logicalTopLayoutOverflow() const
     {
         return InlineFlowBox::logicalTopLayoutOverflow(lineTop());
     }
     LayoutUnit logicalBottomLayoutOverflow() const
     {
         return InlineFlowBox::logicalBottomLayoutOverflow(lineBottom());
     }
 
-#if ENABLE(CSS3_TEXT)
     // Used to calculate the underline offset for TextUnderlinePositionUnder.
     float maxLogicalTop() const;
-#endif // CSS3_TEXT
 
     Node* getLogicalStartBoxWithNode(InlineBox*&) const;
     Node* getLogicalEndBoxWithNode(InlineBox*&) const;
 
 #ifndef NDEBUG
     virtual const char* boxName() const;
 #endif
 private:
     LayoutUnit lineSnapAdjustment(LayoutUnit delta = 0) const;
 
@@ skipping 45 matching lines @@
     OwnPtr<LineFragmentationData> m_fragmentationData;
 
     // Floats hanging off the line are pushed into this vector during layout. It is only
     // good for as long as the line has not been marked dirty.
     OwnPtr<Vector<RenderBox*> > m_floats;
 };
 
 } // namespace WebCore
 
 #endif // RootInlineBox_h