Changed LinkedHashSet to Set and LinkedHashMap to Map.

sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.dart

 // Copyright (c) 2012, 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 mirrors_dart2js;
 
 import 'dart:async';
-import 'dart:collection' show LinkedHashMap;
 
 import '../../compiler.dart' as api;
 import '../elements/elements.dart';
 import '../apiimpl.dart' as apiimpl;
 import '../scanner/scannerlib.dart' hide SourceString;
 import '../resolution/resolution.dart' show Scope;
 import '../dart2jslib.dart';
 import '../dart_types.dart';
 import '../tree/tree.dart';
 import '../util/util.dart' show Spannable, Link;
@@ skipping 1575 matching lines @@
   Map<String,Constant> _fieldMapCache;
 
   Dart2JsConstructedConstantMirror(Dart2JsMirrorSystem mirrors,
                                    ConstructedConstant constant)
       : super(mirrors, constant);
 
   ConstructedConstant get _constant => super._constant;
 
   Map<String,Constant> get _fieldMap {
     if (_fieldMapCache == null) {
-      _fieldMapCache = new LinkedHashMap<String,Constant>();
+      _fieldMapCache = new Map<String,Constant>();
       if (identical(_constant.type.element.kind, ElementKind.CLASS)) {
         var index = 0;
         ClassElement element = _constant.type.element;
         element.forEachInstanceField((_, Element field) {
           String fieldName = field.name.slowToString();
           _fieldMapCache.putIfAbsent(fieldName, () => _constant.fields[index]);
           index++;
         }, includeSuperAndInjectedMembers: true);
       }
     }
@@ skipping 135 matching lines @@
  *
  * All API in this class is experimental.
  */
 class BackDoor {
   /// Return the compilation units comprising [library].
   static List<Mirror> compilationUnitsOf(Dart2JsLibraryMirror library) {
     return library._library.compilationUnits.toList().map(
         (cu) => new Dart2JsCompilationUnitMirror(cu, library)).toList();
   }
 }