Cleanup ColorDistance

Source/core/svg/ColorDistance.h

Index: Source/core/svg/ColorDistance.h
diff --git a/Source/core/svg/ColorDistance.h b/Source/core/svg/ColorDistance.h
index 470effb7598e78833267dbcf63478987e25d34a9..0eddc28daa2bf9c8b001d5ab45668781a51418f4 100644
--- a/Source/core/svg/ColorDistance.h
+++ b/Source/core/svg/ColorDistance.h
@@ -26,20 +26,10 @@ 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 Color clampColor(int red, int green, int blue, int alpha);
-
-    float distance() const;
-
-private:
-    int m_redDiff;
-    int m_greenDiff;
-    int m_blueDiff;
+    static float distance(const Color& fromColor, const Color& toColor);
 };
+
 }
 
 #endif // ColorDistance_h