cleanups

OpenRA.Gl/GraphicsDevice.cs

@@ -11,7 +11,6 @@
 using System;
 using System.Drawing;
 using System.IO;
-using System.Windows.Forms;
 using OpenRA.FileFormats.Graphics;
 using Tao.Cg;
 using Tao.OpenGl;
@@ -128,9 +127,6 @@ namespace OpenRA.GlRenderer
 			CheckGlError();
 		}
 
-		public void Begin() { }
-		public void End() { }
-
 		public void Clear( Color c )
 		{
 			Gl.glClearColor( 0, 0, 0, 0 );