Minor fixes in dart2js.

lib/compiler/implementation/elements/elements.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('elements');
 
 #import('dart:uri');
 
 #import('../tree/tree.dart');
 #import('../scanner/scannerlib.dart');
@@ skipping 634 matching lines @@
 
   bool hasLibraryName() => libraryTag !== null;
 
   /**
    * Returns the library name (as defined by the #library tag) or for script
    * (which have no #library tag) the script file name. The latter case is used
    * to private 'library name' for scripts to use for instance in dartdoc.
    */
   String getLibraryOrScriptName() {
     if (libraryTag !== null) {
-      return libraryTag.argument.dartString.slowToString();
+      return libraryTag.name.toString();
     } else {
       // Use the file name as script name.
       String path = uri.path;
       return path.substring(path.lastIndexOf('/') + 1);
     }
   }
 
   // TODO(johnniwinther): Rewrite to avoid the optional argument.
   Scope buildEnclosingScope({bool patchScope: false}) {
     if (origin !== null) {
@@ skipping 1207 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }