gtk: Remove the custom code for ColorSelectionDialog

It has been obsolete for quite a while, and had a scary warning.

gtk/ColorSelectionDialog.cs

@@ -1,40 +0,0 @@
-// Gtk.ColorSelectionDialog.cs - Gtk ColorSelectionDialog class customizations
-//
-// Author: Duncan Mak  (duncan@ximian.com)
-//
-// Copyright (C) 2002 Ximian, Inc. 
-//
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of version 2 of the Lesser GNU General 
-// Public License as published by the Free Software Foundation.
-//
-// This program 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
-// Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public
-// License along with this program; if not, write to the
-// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-// Boston, MA 02111-1307, USA.
-
-namespace Gtk {
-
-	using System;
-
-	public partial class ColorSelectionDialog {
-
-		[Obsolete ("Do not use this class. It will cause your app to crash in mysterious ways.")]
-		public class ColorSelectionButton : Gtk.Button {
-			private ColorSelectionDialog color_sel;
-
-			public ColorSelectionDialog ColorSelectionDialog {
-				get { return color_sel; }
-			}
-
-			public ColorSelectionButton (ColorSelectionDialog cs, IntPtr raw) : base (raw) {
-				color_sel = cs;
-			}
-		}
-	}
-}

gtk/Makefile.am

@@ -32,7 +32,6 @@ sources = 				\
 	ChildPropertyAttribute.cs	\
 	Clipboard.cs			\
 	ColorSelection.cs		\
-	ColorSelectionDialog.cs	\
 	ComboBox.cs			\
 	ComboBoxText.cs			\
 	Container.cs			\