Changed LinkedHashSet to Set and LinkedHashMap to Map.

sdk/lib/_internal/compiler/implementation/elements/modelx.dart

 // Copyright (c) 2013, 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 elements.modelx;
 
-import 'dart:collection' show LinkedHashMap;
-
 import 'elements.dart';
 import '../../compiler.dart' as api;
 import '../tree/tree.dart';
 import '../util/util.dart';
 import '../resolution/resolution.dart';
 
 import '../dart2jslib.dart' show invariant,
                                  InterfaceType,
                                  DartType,
                                  TypeVariableType,
@@ skipping 724 matching lines @@
    * Link for elements exported either through export declarations or through
    * declaration. This field should not be accessed directly but instead through
    * the [exports] getter.
    *
    * [LibraryDependencyHandler] sets this field through [setExports] when the
    * library is loaded.
    */
   Link<Element> slotForExports;
 
   final Map<LibraryDependency, LibraryElement> tagMapping =
-      new LinkedHashMap<LibraryDependency, LibraryElement>();
+      new Map<LibraryDependency, LibraryElement>();
 
   LibraryElementX(Script script, [Uri canonicalUri, LibraryElement this.origin])
     : this.canonicalUri = ((canonicalUri == null) ? script.uri : canonicalUri),
       importers = new Map<Element, Link<Import>>(),
       super(new SourceString(script.name), ElementKind.LIBRARY, null) {
     entryCompilationUnit = new CompilationUnitElementX(script, this);
     if (isPatch) {
       origin.patch = this;
     }
   }
@@ skipping 1565 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }