dart2js: Use the correct hashes for deferred code in the startup-emitter.

pkg/compiler/lib/src/js_emitter/startup_emitter/deferred_fragment_hash.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.
 
-part of dart2js.js_emitter.full_emitter;
+part of dart2js.js_emitter.startup_emitter.model_emitter;
 
-class _DeferredOutputUnitHash extends jsAst.DeferredString {
+class _DeferredFragmentHash extends js.DeferredString {
   String _hash;
-  final OutputUnit _outputUnit;
+  final DeferredFragment _fragment;
 
-  _DeferredOutputUnitHash(this._outputUnit);
+  _DeferredFragmentHash(this._fragment);
 
   void setHash(String hash) {
     assert(_hash == null);
     _hash = hash;
   }
 
+  @override
   String get value {
     assert(_hash != null);
+    // Note the additional quotes in the returned value.
     return '"$_hash"';
   }
 
-  String toString() => "HashCode for ${_outputUnit} [$_hash]";
+  String toString() => "HashCode for ${_fragment} [$_hash]";
 }