Remove unused 'PixelFormatExtensions::ComputeScanlineCount'

Source/Engine/Graphics/PixelFormatExtensions.h

@@ -165,14 +165,6 @@ public:
     /// <returns>True if given format contains integer data type (signed or unsigned), otherwise false.</returns>
     API_FUNCTION() static bool IsInteger(PixelFormat format);
 
-    /// <summary>
-    /// Computes the scanline count (number of scanlines).
-    /// </summary>
-    /// <param name="format">The <see cref="PixelFormat"/>.</param>
-    /// <param name="height">The height.</param>
-    /// <returns>The scanline count.</returns>
-    API_FUNCTION() static int32 ComputeScanlineCount(PixelFormat format, int32 height);
-
     /// <summary>
     /// Computes the format components count (number of R, G, B, A channels).
     /// </summary>