[shotwell] Fix non-matching generic types of inferface implementations

[Rico Tzschichholz <ricotz src gnome org>]

commit 389e23b763a851a93cb6b2b8e4bd0165e754d7c5
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Fri Sep 30 18:58:54 2016 +0200

    Fix non-matching generic types of inferface implementations

 src/Tag.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/Tag.vala b/src/Tag.vala
index 81d7d7d..46cbfaa 100644
--- a/src/Tag.vala
+++ b/src/Tag.vala
@@ -233,7 +233,7 @@ public class TagSourceCollection : ContainerSourceCollection {
     }
     
     protected override void notify_container_contents_removed(ContainerSource container, 
-        Gee.Collection<DataSource> removed, bool unlinking) {
+        Gee.Collection<DataObject> removed, bool unlinking) {
         Tag tag = (Tag) container;
         Gee.Collection<MediaSource> sources = (Gee.Collection<MediaSource>) removed;