Remove deprecated parts of dart:async.

editor/tools/plugins/com.google.dart.tools.core_test/src-dart/pub_package_server.dart

Index: editor/tools/plugins/com.google.dart.tools.core_test/src-dart/pub_package_server.dart
diff --git a/editor/tools/plugins/com.google.dart.tools.core_test/src-dart/pub_package_server.dart b/editor/tools/plugins/com.google.dart.tools.core_test/src-dart/pub_package_server.dart
index a346f98d9a8b46ce421a06c102cb2ba2de7c2c37..18d591cc40462aa81c2bdc733b5bba24c7d658e7 100644
--- a/editor/tools/plugins/com.google.dart.tools.core_test/src-dart/pub_package_server.dart
+++ b/editor/tools/plugins/com.google.dart.tools.core_test/src-dart/pub_package_server.dart
@@ -57,8 +57,8 @@ void requestReceivedHandler(request) {
       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();