[pitivi] undo: Remove unuseful fields

[Alexandru Băluț <alexbalut src gnome org>]

commit ae771fe3f598af894790a4280dfc650cfd47cc2c
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Tue May 3 01:58:58 2016 +0200

    undo: Remove unuseful fields
    
    Differential Revision: https://phabricator.freedesktop.org/D987

 pitivi/undo/timeline.py |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)
---
diff --git a/pitivi/undo/timeline.py b/pitivi/undo/timeline.py
index c48a89e..571ffe6 100644
--- a/pitivi/undo/timeline.py
+++ b/pitivi/undo/timeline.py
@@ -543,9 +543,6 @@ class TimelineObserver(Loggable):
         action_log (UndoableActionLog): The action log where to report actions.
     """
 
-    timelinePropertyChangedAction = ClipPropertyChanged
-    activePropertyChangedAction = ActivePropertyChanged
-
     def __init__(self, action_log, app):
         Loggable.__init__(self)
         self.action_log = action_log
@@ -697,8 +694,8 @@ class TimelineObserver(Loggable):
         attr_name = "last-%s" % property_name
         new_value = clip.get_property(property_name)
         old_value = getattr(tracker, attr_name)
-        action = self.timelinePropertyChangedAction(clip, property_name,
-                                                    old_value, new_value)
+        action = ClipPropertyChanged(clip, property_name,
+                                     old_value, new_value)
         setattr(tracker, attr_name, new_value)
         self.action_log.push(action)
 
@@ -733,7 +730,7 @@ class TimelineObserver(Loggable):
         """
         This happens when an effect is (de)activated on a clip in the timeline.
         """
-        action = self.activePropertyChangedAction(add_effect_action, active)
+        action = ActivePropertyChanged(add_effect_action, active)
         self.action_log.push(action)
 
     def _controlSourceKeyFrameMovedCb(self, tracker, control_source,