[mutter/gnome-3-34] wayland: Drop unused wl_signal structs

[Carlos Garnacho <carlosg src gnome org>]

commit eac37b17b06d24e4e2486c25edcd1c9122b1782c
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Nov 20 00:27:54 2019 +0100

    wayland: Drop unused wl_signal structs
    
    Those were used to signal clipboard ownership around, but that got
    replaced by MetaSelection and friends. These signals are no longer
    listened on, so can be safely removed.
    
    https://gitlab.gnome.org/GNOME/mutter/issues/591
    
    (cherry picked from commit 46b3811e22b3b898342141b1575c888285e51caf)

 src/wayland/meta-wayland-data-device.c | 11 -----------
 src/wayland/meta-wayland-data-device.h |  4 ----
 2 files changed, 15 deletions(-)
---
diff --git a/src/wayland/meta-wayland-data-device.c b/src/wayland/meta-wayland-data-device.c
index 38aa0f317..6795bf0e7 100644
--- a/src/wayland/meta-wayland-data-device.c
+++ b/src/wayland/meta-wayland-data-device.c
@@ -1318,7 +1318,6 @@ selection_data_source_destroyed (gpointer data, GObject *object_was_here)
         wl_data_device_send_selection (data_device_resource, NULL);
     }
 
-  wl_signal_emit (&data_device->selection_ownership_signal, NULL);
   unset_selection_source (data_device, META_SELECTION_CLIPBOARD);
 }
 
@@ -1614,8 +1613,6 @@ meta_wayland_data_device_set_dnd_source (MetaWaylandDataDevice *data_device,
   if (source)
     g_object_add_weak_pointer (G_OBJECT (data_device->dnd_data_source),
                                (gpointer *)&data_device->dnd_data_source);
-
-  wl_signal_emit (&data_device->dnd_ownership_signal, source);
 }
 
 void
@@ -1673,8 +1670,6 @@ meta_wayland_data_device_set_selection (MetaWaylandDataDevice *data_device,
           wl_data_device_send_selection (data_device_resource, offer);
         }
     }
-
-  wl_signal_emit (&data_device->selection_ownership_signal, source);
 }
 
 static void
@@ -1735,7 +1730,6 @@ primary_source_destroyed (gpointer  data,
         gtk_primary_selection_device_send_selection (data_device_resource, NULL);
     }
 
-  wl_signal_emit (&data_device->primary_ownership_signal, NULL);
   unset_selection_source (data_device, META_SELECTION_PRIMARY);
 }
 
@@ -1804,8 +1798,6 @@ meta_wayland_data_device_set_primary (MetaWaylandDataDevice *data_device,
           gtk_primary_selection_device_send_selection (data_device_resource, offer);
         }
     }
-
-  wl_signal_emit (&data_device->primary_ownership_signal, source);
 }
 
 static void
@@ -2022,9 +2014,6 @@ meta_wayland_data_device_init (MetaWaylandDataDevice *data_device)
 {
   wl_list_init (&data_device->resource_list);
   wl_list_init (&data_device->primary_resource_list);
-  wl_signal_init (&data_device->selection_ownership_signal);
-  wl_signal_init (&data_device->primary_ownership_signal);
-  wl_signal_init (&data_device->dnd_ownership_signal);
 }
 
 static struct wl_resource *
diff --git a/src/wayland/meta-wayland-data-device.h b/src/wayland/meta-wayland-data-device.h
index efa5478bf..c61c241a5 100644
--- a/src/wayland/meta-wayland-data-device.h
+++ b/src/wayland/meta-wayland-data-device.h
@@ -67,10 +67,6 @@ struct _MetaWaylandDataDevice
   MetaWaylandDragGrab *current_grab;
   struct wl_client *focus_client;
 
-  struct wl_signal selection_ownership_signal;
-  struct wl_signal dnd_ownership_signal;
-  struct wl_signal primary_ownership_signal;
-
   guint selection_owner_signal_id;
 
   MetaSelectionSource *owners[META_N_SELECTION_TYPES];