message: Rename ref to timelinePanel
diff: @@ -209,10 +209,10 @@ const FilePanel = createReactClass({
  },
  _getScrollState: function() {
  - const messagePanel = this._messagePanel;
  - const scrollState = messagePanel.getScrollState();
  + const timelinePanel = this._timelinePanel;
  + const scrollState = timelinePanel.getScrollState();
  - if (!messagePanel) return null;
  + if (!timelinePanel) return null;
  if (!scrollState || scrollState.stuckAtBottom) {
  return null;
  @@ -225,7 +225,7 @@ const FilePanel = createReactClass({
  },
  _getTimelinePanelRef: function(ref) {
  - this._messagePanel = ref;
  + this._timelinePanel = ref;
  },
  render: function() {
  