Remove Gtk 2 compatibility code

It is useless now that we require Gtk 3.

https://bugzilla.gnome.org/show_bug.cgi?id=638315

src/Makefile-tray.am

@@ -15,7 +15,6 @@ TRAY_STAMP_FILES = stamp-na-marshal.h
 
 # please, keep this sorted alphabetically
 tray_source =			\
-	gtk-compat.h		\
 	tray/na-tray-child.c	\
 	tray/na-tray-child.h	\
 	tray/na-tray-manager.c	\

src/Makefile.am

@@ -90,7 +90,6 @@ libgnome_shell_la_SOURCES =		\
 	shell-window-tracker-private.h	\
 	shell-wm-private.h		\
 	gnome-shell-plugin.c		\
-	gtk-compat.h			\
 	shell-app.c			\
 	shell-app-system.c		\
 	shell-app-usage.c		\

src/gtk-compat.h

@@ -1,19 +0,0 @@
-#ifndef __GTK_COMPAT_H__
-#define __GTK_COMPAT_H__
-
-#include <gtk/gtk.h>
-
-/* Provide a compatibility layer for accessor functions introduced
- * in GTK+ 2.20 which we need to build with GSEAL_ENABLE.
- * That way it is still possible to build with GTK+ 2.18 when not
- * using GSEAL_ENABLE
- */
-
-#if !GTK_CHECK_VERSION(2, 20, 0)
-
-#define gtk_widget_get_realized(w) GTK_WIDGET_REALIZED (w)
-#define gtk_widget_get_mapped(w)   GTK_WIDGET_MAPPED (w)
-
-#endif /* GTK_CHECK_VERSION(2, 20, 0) */
-
-#endif /* __GTK_COMPAT_H__ */

src/shell-embedded-window.c

@@ -6,7 +6,6 @@
 #include <clutter/x11/clutter-x11.h>
 
 #include "shell-embedded-window-private.h"
-#include "gtk-compat.h"
 
 /* This type is a subclass of GtkWindow that ties the window to a
  * ShellGtkEmbed; the window is reparented into the stage

src/shell-gtk-embed.c

@@ -3,7 +3,6 @@
 #include "config.h"
 
 #include "shell-embedded-window-private.h"
-#include "gtk-compat.h"
 
 #include <gdk/gdkx.h>
 

src/shell-tray-icon.c

@@ -5,7 +5,6 @@
 #include "shell-tray-icon.h"
 #include "shell-gtk-embed.h"
 #include "shell-window-tracker.h"
-#include "gtk-compat.h"
 #include "tray/na-tray-child.h"
 #include <gdk/gdkx.h>
 #include "st.h"

src/tray/na-tray-child.c

@@ -23,7 +23,6 @@
 #include <string.h>
 
 #include "na-tray-child.h"
-#include "gtk-compat.h"
 
 #include <glib/gi18n-lib.h>
 #include <gdk/gdk.h>

src/tray/na-tray-manager.c

@@ -25,7 +25,6 @@
 #include <libintl.h>
 
 #include "na-tray-manager.h"
-#include "gtk-compat.h"
 
 #include <glib/gi18n-lib.h>
 #if defined (GDK_WINDOWING_X11)