Make sure declared upper bounds are resolved when finalizing a type containing a

tests/language/regress_23089_test.dart

+// Copyright (c) 2015, 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.
+
+abstract class IPeer<C extends IP2PClient> {
+}
+
+abstract class IPeerRoom<P extends IPeer, C extends IP2PClient> {
+}
+
+abstract class IP2PClient<R extends IPeerRoom> {
+
+}
+
+class _Peer<C extends _P2PClient> implements IPeer<C> {
+
+}
+
+class _PeerRoom<P extends _Peer, C extends _P2PClient>
+    implements IPeerRoom<P, C> {
+
+}
+
+abstract class _P2PClient<R extends _PeerRoom, P extends _Peer>
+    implements IP2PClient<R> {
+
+}
+
+void main() {
+}