systrace: update to trace-viewer rev 237

Change-Id: I3ebd2235f528d2eae22256027ca547d85d9a0904
diff --git a/init.js b/init.js
index 357afde..7c95f0f 100644
--- a/init.js
+++ b/init.js
@@ -6,11 +6,11 @@
   if (!linuxPerfData)
     return;
 
-  var m = new tracing.TimelineModel();
+  var m = new tracing.Model();
   m.importEvents("[]", true, [linuxPerfData]);
 
   var timelineViewEl = document.querySelector('.view');
-  cr.ui.decorate(timelineViewEl, tracing.TimelineView);
+  tracing.ui.decorate(timelineViewEl, tracing.TimelineView);
   timelineViewEl.model = m;
   timelineViewEl.tabIndex = 1;
   timelineViewEl.timeline.focusElement = timelineViewEl;