[gnome-games] core: Remove Plugin.get_game_source()

[Adrien Plazas <aplazas src gnome org>]

commit b019050d19560ff3e7ecb59cb7fbf9d31367fc93
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun May 7 13:18:12 2017 +0200

    core: Remove Plugin.get_game_source()
    
    This is needed to remove GameSource.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781334

 src/core/plugin.vala |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)
---
diff --git a/src/core/plugin.vala b/src/core/plugin.vala
index 847da84..74d8a3e 100644
--- a/src/core/plugin.vala
+++ b/src/core/plugin.vala
@@ -1,10 +1,6 @@
 // This file is part of GNOME Games. License: GPL-3.0+.
 
 public interface Games.Plugin : Object {
-       public virtual GameSource? get_game_source () throws Error {
-               return null;
-       }
-
        public virtual string[] get_mime_types () {
                return {};
        }