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 2c8fa8082c1c460f9e4b730d5168829bcbb39f02..853ff74ad12c6024a9e4b8dc57a7e4005dae118b 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
@@ -58,8 +58,8 @@ 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();