Fix some warnings in pub and pkg packages.

pkg/scheduled_test/lib/src/scheduled_server/safe_http_server.dart

Index: pkg/scheduled_test/lib/src/scheduled_server/safe_http_server.dart
diff --git a/pkg/scheduled_test/lib/src/scheduled_server/safe_http_server.dart b/pkg/scheduled_test/lib/src/scheduled_server/safe_http_server.dart
index 7e4e4ccc28c0280899959f13455ba6b8c060fafb..37b16c83391044bfaba64a6d02162de4f66d994b 100644
--- a/pkg/scheduled_test/lib/src/scheduled_server/safe_http_server.dart
+++ b/pkg/scheduled_test/lib/src/scheduled_server/safe_http_server.dart
@@ -135,7 +135,7 @@ class _HttpResponseWrapper implements HttpResponse {
   Future<HttpResponse> consume(Stream<List<int>> stream) =>
     _inner.consume(stream);
   Future<HttpResponse> addStream(Stream<List<int>> stream) =>
-    _inner.writeStream(stream);
+    _inner.addStream(stream);
   Future<HttpResponse> writeStream(Stream<List<int>> stream) =>
     _inner.writeStream(stream);
   Future close() => _inner.close();
@@ -144,4 +144,5 @@ class _HttpResponseWrapper implements HttpResponse {
     _inner.writeAll(objects, separator);
   void writeCharCode(int charCode) => _inner.writeCharCode(charCode);
   void writeln([Object obj = ""]) => _inner.writeln(obj);
+  void addError(AsyncError error) => _inner.addError(error);
 }