DevTools: Remove target function from TimelineModel

Source/devtools/front_end/timeline/TimelineTracingView.js

 /*
  * Copyright 2014 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /**
  * @constructor
  * @implements {WebInspector.TimelineModeView}
  * @implements {WebInspector.FlameChartDelegate}
@@ skipping 117 matching lines @@
          */
         function appendPreviewAndShowDetails(node)
         {
             if (node)
                 contentHelper.appendElementRow("Preview", node);
             this._delegate.showInDetails(WebInspector.UIString("Selected Event"), contentHelper.element);
         }
         var recordTypes = WebInspector.TracingTimelineModel.RecordType;
         switch (record.name) {
         case recordTypes.PictureSnapshot:
-            WebInspector.TracingTimelineUIUtils.buildPicturePreviewContent(this._tracingModel.target(), record.args["snapshot"]["skp64"], appendPreviewAndShowDetails.bind(this));
+            var target = record.thread.target();
+            if (target)

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

We still need to show some details when the target is absent.

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

Done.

+                WebInspector.TracingTimelineUIUtils.buildPicturePreviewContent(target, record.args["snapshot"]["skp64"], appendPreviewAndShowDetails.bind(this));
             break;
         case recordTypes.LayerTreeHostImplSnapshot:
             var link = document.createElement("span");
             link.classList.add("revealable-link");
             link.textContent = "show";
             link.addEventListener("click", reveal, false);
             contentHelper.appendElementRow(WebInspector.UIString("Layer tree"), link);
             // Fall-through intended.
         default:
             this._delegate.showInDetails(WebInspector.UIString("Selected Event"), contentHelper.element);
@@ skipping 396 matching lines @@
     /**
      * @param {string} string
      * @return {string}
      */
     colorForString: function(string)
     {
         var hash = WebInspector.TraceViewPalette._stringHash(string);
         return this._palette[hash % this._palette.length];
     }
 };