Remove deprecated parts of dart:async.

editor/tools/plugins/com.google.dart.tools.core_test/src-dart/pub_package_server.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.
 
 /// Runs a HTTP server on localhost that mimics the behavoir of pub.dartlang.org
 /// and serves files on pub requests. Files to be stored are on disk in the file
 /// system.
 ///
 /// The port for the server and the base directory of the data to be served
 /// should be passed in as arguments
@@ skipping 39 matching lines @@
       file = new File('$baseDir$path.txt');
     } else {
       file = new File('$baseDir$path');
     }
 
     file.readAsBytes().then((data) {
       response.statusCode = 200;
       response.contentLength = data.length;
       response.add(data);
       response.close();
-    }).catchError((e) {
-      print(getAttachedStackTrace(e));
+    }).catchError((e, trace) {
+      print(trace);
       response.statusCode = 404;
       response.contentLength = 0;
       response.close();
     });
   } catch (e) {
     print(e);
     response.statusCode = 500;
     response.close();
     return;
   }
 }