Remove unused inline FontMetrics.scaleEmToUnits method.

Source/platform/fonts/FontMetrics.h

 /*
  * Copyright (C) Research In Motion Limited 2010-2011. 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 155 matching lines @@
     float m_xHeight;
     float m_zeroWidth;
     float m_underlinethickness;
     float m_underlinePosition;
     int m_ascentInt;
     int m_descentInt;
     bool m_hasXHeight;
     bool m_hasZeroWidth;
 };
 
-inline float scaleEmToUnits(float x, unsigned unitsPerEm)
-{
-    return unitsPerEm ? x / unitsPerEm : x;
-}
-
 } // namespace blink
 
 #endif // FontMetrics_h