SD samples should not requiere SWF

svn path=/trunk/mcs/; revision=40069

mcs/class/System.Drawing/Samples/System.Drawing/region.cs

@@ -10,7 +10,7 @@ using System.Drawing.Drawing2D;
 namespace MyFormProject
 {
 
-	class MainForm : System.Windows.Forms.Form
+	class MainForm 
 	{
 		public MainForm()
 		{
@@ -28,4 +28,4 @@ namespace MyFormProject
 		}
 	}
 
-}
+}