DevTools: Remove target function from TimelineModel

Source/devtools/front_end/timeline/TracingTimelineModel.js

Index: Source/devtools/front_end/timeline/TracingTimelineModel.js
diff --git a/Source/devtools/front_end/timeline/TracingTimelineModel.js b/Source/devtools/front_end/timeline/TracingTimelineModel.js
index ba539129b15c658676489cf81855768ee29cb4bc..095e57bd761357a17e1135c21355bb551208e5df 100644
--- a/Source/devtools/front_end/timeline/TracingTimelineModel.js
+++ b/Source/devtools/front_end/timeline/TracingTimelineModel.js
@@ -10,7 +10,7 @@
  */
 WebInspector.TracingTimelineModel = function(tracingModel, recordFilter)
 {
-    WebInspector.TimelineModel.call(this, tracingModel.target());
+    WebInspector.TimelineModel.call(this);
     this._tracingModel = tracingModel;
     this._inspectedTargetEvents = [];
     this._recordFilter = recordFilter;
@@ -617,7 +617,8 @@ WebInspector.TracingTimelineModel.TraceEventRecord.prototype = {
      */
     target: function()
     {
-        return this._model.target();
+        //FIXME: get it from this._event

[caseq, 2014/07/17 16:36:44]

Why not do it now?

[sergeyv, 2014/07/17 17:07:07]

Because thread has nullable target, and Record has non-nullable. I will fix it
in next patch 

+        return WebInspector.targetManager.targets()[0];
     },
 
     /**