Fix bad space handling in Uris.

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 'elements.dart';
 import '../../compiler.dart' as api;
 import '../tree/tree.dart';
 import '../util/util.dart';
@@ skipping 953 matching lines @@
    */
   String getLibraryName() {
     if (libraryTag == null) return '';
     return libraryTag.name.toString();
   }
 
   /**
    * 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.
+   *
+   * Note: the returned filename will still be escaped ("a%20b.dart" instead of
+   * "a b.dart").
    */
   String getLibraryOrScriptName() {
     if (libraryTag != null) {
       return libraryTag.name.toString();
     } else {
       // Use the file name as script name.
       String path = canonicalUri.path;
       return path.substring(path.lastIndexOf('/') + 1);
     }
   }
@@ skipping 1457 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }