Cleanup native, collected, and stub code handling in profiler

runtime/bin/vmservice/client/lib/src/observatory/view_model.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of observatory;
 
 abstract class TableTreeRow extends Observable {
   final TableTreeRow parent;
   @observable final int depth;
   @observable final List<TableTreeRow> children = new List<TableTreeRow>();
@@ skipping 42 matching lines @@
   /// Initialize the table tree with the list of root children.
   void initialize(List<TableTreeRow> children) {
     rows.clear();
     rows.addAll(children);
   }
 
   /// Toggle expansion of row at [rowIndex].
   void toggle(int rowIndex) {
     assert(rowIndex >= 0);
     assert(rowIndex < rows.length);
-    print(rowIndex);
-    print(rows.length);
     var row = rows[rowIndex];
     if (row.toggle()) {
       _expand(row);
     } else {
       _collapse(row);
     }
-    print('e');
   }
 
   int _index(TableTreeRow row) => rows.indexOf(row);
 
   void _insertRow(int index, TableTreeRow row) {
     if (index == -1) {
       rows.add(row);
     } else {
       rows.insert(index, row);
     }
@@ skipping 20 matching lines @@
     }
     // Collapse this row.
     row.expanded = false;
     // Remove all children.
     int index = _index(row);
     for (var i = 0; i < childCount; i++) {
       rows.removeAt(index + 1);
     }
   }
 }