Clean ups for warnings and unused code.

pkg/analysis_server/test/analysis_notification_outline_test.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.
 
 library test.domain.analysis.notification.outline;
 
 import 'dart:async';
 import 'dart:mirrors';
 
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 621 matching lines @@
 
   const _OutlineKind(this.name);
 
   static _OutlineKind valueOf(String name) {
     ClassMirror classMirror = reflectClass(_OutlineKind);
     return classMirror.getField(new Symbol(name)).reflectee;
   }
 }
 
 
+/**
+ * An element outline.
+ */
 class _Outline {
   static const List<_Outline> EMPTY_ARRAY = const <_Outline>[];
 
-  _Outline parent;
   final _OutlineKind kind;
   final String name;
   final int nameOffset;
   final int nameLength;
   final int elementOffset;
   final int elementLength;
   final bool isAbstract;
   final bool isStatic;
   final String parameters;
   final String returnType;
@@ skipping 14 matching lines @@
         map[PARAMETERS], map[RETURN_TYPE]);
     List<Map<String, Object>> childrenMaps = map[CHILDREN];
     if (childrenMaps != null) {
       childrenMaps.forEach((childMap) {
         outline.children.add(new _Outline.fromJson(childMap));
       });
     }
     return outline;
   }
 }