[gnome-games/wip/aplazas/781334-refactor-game-sources] core: Move GameCallback to its own file

[Adrien Plazas <aplazas src gnome org>]

commit 7af893e7327a732432c68c8468a6b3e037dbe07f
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun May 7 13:25:24 2017 +0200

    core: Move GameCallback to its own file
    
    This is needed to remove GameSource.

 src/Makefile.am             |    1 +
 src/core/game-callback.vala |    3 +++
 src/core/game-source.vala   |    2 --
 3 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index aab8cd2..5e15258 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -43,6 +43,7 @@ gnome_games_SOURCES = \
        \
        core/cover.vala \
        core/game.vala \
+       core/game-callback.vala \
        core/game-collection.vala \
        core/game-source.vala \
        core/game-uri-adapter.vala \
diff --git a/src/core/game-callback.vala b/src/core/game-callback.vala
new file mode 100644
index 0000000..e745792
--- /dev/null
+++ b/src/core/game-callback.vala
@@ -0,0 +1,3 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+public delegate void Games.GameCallback (Game game);
diff --git a/src/core/game-source.vala b/src/core/game-source.vala
index 1156b1d..27fe565 100644
--- a/src/core/game-source.vala
+++ b/src/core/game-source.vala
@@ -3,5 +3,3 @@
 public interface Games.GameSource : Object {
        public abstract async void each_game (GameCallback callback);
 }
-
-public delegate void Games.GameCallback (Game game);