[mutter] wayland: Define abstract role types as actually abstract

[Jonas Ådahl <jadahl src gnome org>]

commit 4345906663f22e5ad0296d06e5fccafac86ccb3d
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Feb 23 19:05:05 2018 +0800

    wayland: Define abstract role types as actually abstract
    
    They should not be instantiated by themself, only as actual roles.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/5
    https://bugzilla.gnome.org/show_bug.cgi?id=791938

 src/wayland/meta-wayland-actor-surface.c | 6 +++---
 src/wayland/meta-wayland-shell-surface.c | 6 +++---
 src/wayland/meta-wayland-surface.c       | 6 +++---
 3 files changed, 9 insertions(+), 9 deletions(-)
---
diff --git a/src/wayland/meta-wayland-actor-surface.c b/src/wayland/meta-wayland-actor-surface.c
index 3ffe493f6..c10694a2a 100644
--- a/src/wayland/meta-wayland-actor-surface.c
+++ b/src/wayland/meta-wayland-actor-surface.c
@@ -30,9 +30,9 @@
 #include "wayland/meta-wayland-surface.h"
 #include "wayland/meta-window-wayland.h"
 
-G_DEFINE_TYPE (MetaWaylandActorSurface,
-               meta_wayland_actor_surface,
-               META_TYPE_WAYLAND_SURFACE_ROLE)
+G_DEFINE_ABSTRACT_TYPE (MetaWaylandActorSurface,
+                        meta_wayland_actor_surface,
+                        META_TYPE_WAYLAND_SURFACE_ROLE)
 
 static void
 meta_wayland_actor_surface_assigned (MetaWaylandSurfaceRole *surface_role)
diff --git a/src/wayland/meta-wayland-shell-surface.c b/src/wayland/meta-wayland-shell-surface.c
index a33aa1647..b5f3acacf 100644
--- a/src/wayland/meta-wayland-shell-surface.c
+++ b/src/wayland/meta-wayland-shell-surface.c
@@ -30,9 +30,9 @@
 #include "wayland/meta-wayland-surface.h"
 #include "wayland/meta-window-wayland.h"
 
-G_DEFINE_TYPE (MetaWaylandShellSurface,
-               meta_wayland_shell_surface,
-               META_TYPE_WAYLAND_ACTOR_SURFACE)
+G_DEFINE_ABSTRACT_TYPE (MetaWaylandShellSurface,
+                        meta_wayland_shell_surface,
+                        META_TYPE_WAYLAND_ACTOR_SURFACE)
 
 void
 meta_wayland_shell_surface_calculate_geometry (MetaWaylandShellSurface *shell_surface,
diff --git a/src/wayland/meta-wayland-surface.c b/src/wayland/meta-wayland-surface.c
index 0fd6237f8..0c1d2cd54 100644
--- a/src/wayland/meta-wayland-surface.c
+++ b/src/wayland/meta-wayland-surface.c
@@ -81,9 +81,9 @@ typedef struct _MetaWaylandSurfaceRolePrivate
 
 G_DEFINE_TYPE (MetaWaylandSurface, meta_wayland_surface, G_TYPE_OBJECT);
 
-G_DEFINE_TYPE_WITH_PRIVATE (MetaWaylandSurfaceRole,
-                            meta_wayland_surface_role,
-                            G_TYPE_OBJECT);
+G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (MetaWaylandSurfaceRole,
+                                     meta_wayland_surface_role,
+                                     G_TYPE_OBJECT)
 
 G_DEFINE_TYPE (MetaWaylandPendingState,
                meta_wayland_pending_state,