Different approach to fixing file to URI mapping.

pkg/analyzer/lib/src/generated/sdk.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 analyzer.src.generated.sdk;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
@@ skipping 124 matching lines @@
 }
 
 /**
  * A map from Dart library URI's to the [SdkLibraryImpl] representing that
  * library.
  */
 class LibraryMap {
   /**
    * A table mapping Dart library URI's to the library.
    */
-  HashMap<String, SdkLibraryImpl> _libraryMap =
-      new HashMap<String, SdkLibraryImpl>();
+  LinkedHashMap<String, SdkLibraryImpl> _libraryMap =
+      new LinkedHashMap<String, SdkLibraryImpl>();
 
   /**
    * Return a list containing all of the sdk libraries in this mapping.
    */
   List<SdkLibrary> get sdkLibraries => new List.from(_libraryMap.values);
 
   /**
    * Return a list containing the library URI's for which a mapping is available.
    */
-  List<String> get uris => new List.from(_libraryMap.keys.toSet());
+  List<String> get uris => _libraryMap.keys.toList();
 
   /**
    * Return the library with the given 'dart:' [uri], or `null` if the URI does
    * not map to a library.
    */
   SdkLibrary getLibrary(String uri) => _libraryMap[uri];
 
   /**
    * Set the library with the given 'dart:' [uri] to the given [library].
    */
@@ skipping 278 matching lines @@
     _platforms |= DART2JS_PLATFORM;
   }
 
   /**
    * Record that this library can be run on the VM.
    */
   void setVmLibrary() {
     _platforms |= VM_PLATFORM;
   }
 }