Revert "Use new library/import syntax in dart2js."

sdk/lib/_internal/compiler/implementation/filenames.dart

Index: sdk/lib/_internal/compiler/implementation/filenames.dart
diff --git a/sdk/lib/_internal/compiler/implementation/filenames.dart b/sdk/lib/_internal/compiler/implementation/filenames.dart
index ddfe506b7fcd9c24b8e3a201daefcd8e2d19b4c0..d3f4e7b3ab3baff6a11d3562ffb73defee102b4f 100644
--- a/sdk/lib/_internal/compiler/implementation/filenames.dart
+++ b/sdk/lib/_internal/compiler/implementation/filenames.dart
@@ -2,10 +2,10 @@
 // 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 filenames;
+#library('filenames');
 
-import 'dart:io';
-import 'dart:uri';
+#import('dart:io');
+#import('dart:uri');
 
 // TODO(ahe): This library should be replaced by a general
 // path-munging library.