[gitg] Make icon and widget properties default to null

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 30ff01cae034d8baa64ad20f1e94f7d500b8489a
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Sun Jul 20 16:30:09 2014 +0300

    Make icon and widget properties default to null

 gitg/gitg-ref-action-delete.vala     |   10 ----------
 gitg/gitg-ref-action-rename.vala     |   10 ----------
 libgitg-ext/gitg-ext-ui-element.vala |   10 ++++++++--
 3 files changed, 8 insertions(+), 22 deletions(-)
---
diff --git a/gitg/gitg-ref-action-delete.vala b/gitg/gitg-ref-action-delete.vala
index 6f08323..e0bd2e7 100644
--- a/gitg/gitg-ref-action-delete.vala
+++ b/gitg/gitg-ref-action-delete.vala
@@ -62,16 +62,6 @@ class RefActionDelete : GitgExt.UIElement, GitgExt.Action, GitgExt.RefAction, Ob
                }
        }
 
-       public Gtk.Widget? widget
-       {
-               owned get { return null; }
-       }
-
-       public string? icon
-       {
-               owned get { return null; }
-       }
-
        public void activate()
        {
                var query = new GitgExt.UserQuery();
diff --git a/gitg/gitg-ref-action-rename.vala b/gitg/gitg-ref-action-rename.vala
index 475bf04..2bf6c4d 100644
--- a/gitg/gitg-ref-action-rename.vala
+++ b/gitg/gitg-ref-action-rename.vala
@@ -62,16 +62,6 @@ class RefActionRename : GitgExt.UIElement, GitgExt.Action, GitgExt.RefAction, Ob
                }
        }
 
-       public Gtk.Widget? widget
-       {
-               owned get { return null; }
-       }
-
-       public string? icon
-       {
-               owned get { return null; }
-       }
-
        public void activate()
        {
                action_interface.edit_ref_name(reference, on_ref_name_editing_done);
diff --git a/libgitg-ext/gitg-ext-ui-element.vala b/libgitg-ext/gitg-ext-ui-element.vala
index ab2c806..d189cfb 100644
--- a/libgitg-ext/gitg-ext-ui-element.vala
+++ b/libgitg-ext/gitg-ext-ui-element.vala
@@ -64,7 +64,10 @@ public interface UIElement : Object
         * If provided, the icon will be used in navigation toolbars
         * so that users can switch to the ui element.
         */
-       public abstract string? icon { owned get; }
+       public virtual string? icon
+       {
+               owned get { return null; }
+       }
 
        /**
         * The ui element widget.
@@ -72,7 +75,10 @@ public interface UIElement : Object
         * This widget will be embedded in the gitg UI when
         * the element is activated.
         */
-       public abstract Gtk.Widget? widget { owned get; }
+       public virtual Gtk.Widget? widget
+       {
+               owned get { return null; }
+       }
 
        /**
         * Check whether the ui element is available in the current application state.