Merge 91829 - Web Inspector: [Chromium] REGRESSION: Uncaught TypeError: Cannot read property 'isT...

Source/WebCore/inspector/front-end/DetailedHeapshotView.js

 /*
  * Copyright (C) 2011 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 433 matching lines @@
             return;
         this.snapshotView = snapshotView;
         this._snapshot = snapshot;
         this._nodeIndex = nodeIndex;
         this._prefix = prefix;
         this._resetPaths();
     },
 
     refresh: function()
     {
-        this._resetPaths();
+        if (this.snapshotView)
+            this._resetPaths();
     },
 
     reset: function()
     {
         if (this._state)
             this._state.cancel();
         this.removeChildren();
         this.resetSortingCache();
         this.appendChild(new WebInspector.DataGridNode({path:WebInspector.UIString("Click on an object to show retaining paths"), len:""}, false));
     },
@@ skipping 755 matching lines @@
         return new WebInspector.ProfileSidebarTreeElement(profile, WebInspector.UIString("Snapshot %d"), "heap-snapshot-sidebar-tree-item");
     },
 
     createView: function(profile)
     {
         return new WebInspector.DetailedHeapshotView(WebInspector.panels.profiles, profile);
     }
 }
 
 WebInspector.DetailedHeapshotProfileType.prototype.__proto__ = WebInspector.ProfileType.prototype;