Move Font related classes to Source/platform/fonts

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 129 matching lines @@
     float m_ascent;
     float m_descent;
     float m_lineGap;
     float m_lineSpacing;
     float m_xHeight;
     float m_zeroWidth;
     bool m_hasXHeight;
     bool m_hasZeroWidth;
 };
 
-static inline float scaleEmToUnits(float x, unsigned unitsPerEm)
+inline float scaleEmToUnits(float x, unsigned unitsPerEm)
 {
     return unitsPerEm ? x / unitsPerEm : x;
 }
 
 } // namespace WebCore
 
 #endif // FontMetrics_h