[pitivi] timeline: Avoid using deprecated classes

[Alexandru Băluț <alexbalut src gnome org>]

commit 246f456b699aa67fcb30e880a0e3528392fa7170
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Wed Nov 9 14:35:56 2016 +0100

    timeline: Avoid using deprecated classes
    
    Reviewed-by: Thibault Saunier <tsaunier gnome org>
    Differential Revision: https://phabricator.freedesktop.org/D1463

 pitivi/timeline/timeline.py |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/pitivi/timeline/timeline.py b/pitivi/timeline/timeline.py
index 1956ac9..a733bcc 100644
--- a/pitivi/timeline/timeline.py
+++ b/pitivi/timeline/timeline.py
@@ -1408,9 +1408,11 @@ class TimelineContainer(Gtk.Grid, Zoomable, Loggable):
 
         self.timeline = Timeline(self.app, left_size_group)
 
-        vscrollbar = Gtk.VScrollbar(adjustment=self.timeline.vadj)
+        vscrollbar = Gtk.Scrollbar(orientation=Gtk.Orientation.VERTICAL,
+                                   adjustment=self.timeline.vadj)
         vscrollbar.get_style_context().add_class("background")
-        hscrollbar = Gtk.HScrollbar(adjustment=self.timeline.hadj)
+        hscrollbar = Gtk.Scrollbar(orientation=Gtk.Orientation.HORIZONTAL,
+                                   adjustment=self.timeline.hadj)
         hscrollbar.get_style_context().add_class("background")
 
         self.ruler = ScaleRuler(self)