DevTools: Make target on TimelineRecord nullable

Source/devtools/front_end/timeline/TimelinePanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 1017 matching lines @@
     {
         if (!this._selection) {
             this._updateSelectedRangeStats();
             return;
         }
         switch (this._selection.type()) {
         case WebInspector.TimelineSelection.Type.Record:
             var record = /** @type {!WebInspector.TimelineModel.Record} */ (this._selection.object());
             if (this._tracingTimelineModel) {
                 var event = record.traceEvent();
-                this._uiUtils.generateDetailsContent(record, this._model, this._detailsLinkifier, this._appendDetailsTabsForTraceEventAndShowDetails.bind(this, event), this._model.loadedFromFile());
+                this._uiUtils.generateDetailsContent(record, this._model, this._detailsLinkifier, this._appendDetailsTabsForTraceEventAndShowDetails.bind(this, event));
                 break;
             }
             var title = this._uiUtils.titleForRecord(record);
             this._uiUtils.generateDetailsContent(record, this._model, this._detailsLinkifier, this.showInDetails.bind(this, title), this._model.loadedFromFile());
             break;
         case WebInspector.TimelineSelection.Type.TraceEvent:
             var event = /** @type {!WebInspector.TracingModel.Event} */ (this._selection.object());
-            WebInspector.TracingTimelineUIUtils.buildTraceEventDetails(event, this._tracingTimelineModel, this._detailsLinkifier, this._appendDetailsTabsForTraceEventAndShowDetails.bind(this, event), false);
+            WebInspector.TracingTimelineUIUtils.buildTraceEventDetails(event, this._tracingTimelineModel, this._detailsLinkifier, this._appendDetailsTabsForTraceEventAndShowDetails.bind(this, event));
             break;
         case WebInspector.TimelineSelection.Type.Frame:
             var frame = /** @type {!WebInspector.TimelineFrame} */ (this._selection.object());
             this.showInDetails(WebInspector.UIString("Frame Statistics"), WebInspector.TimelineUIUtils.generateDetailsContentForFrame(this._lazyFrameModel, frame));
             if (frame.layerTree) {
                 var layersView = this._layersView();
                 layersView.showLayerTree(frame.layerTree, frame.paints);
                 this._detailsView.appendTab("layers", WebInspector.UIString("Layers"), layersView);
             }
             break;
@@ skipping 423 matching lines @@
      * @param {!WebInspector.TimelineModel.Record} record
      * @return {boolean}
      */
     accept: function(record)
     {
         return !this._regex || this._uiUtils.testContentMatching(record, this._regex);
     },
 
     __proto__: WebInspector.TimelineModel.Filter.prototype
 }