Cleanup ColorDistance

Source/core/svg/ColorDistance.h

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  *
  * 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef ColorDistance_h
 #define ColorDistance_h
 
 namespace WebCore {
 
 class Color;
 
 class ColorDistance {
 public:
-    ColorDistance();
-    ColorDistance(const Color& fromColor, const Color& toColor);
-    ColorDistance(int redDiff, int blueDiff, int greenDiff);
+    static Color addColors(const Color&, const Color&);
+    static float distance(const Color& fromColor, const Color& toColor);
+};
 
-    static Color addColors(const Color&, const Color&);
-    static Color clampColor(int red, int green, int blue, int alpha);
-
-    float distance() const;
-
-private:
-    int m_redDiff;
-    int m_greenDiff;
-    int m_blueDiff;
-};
 }
 
 #endif // ColorDistance_h