Start trying to compile platform from unpatched sources.

sdk/lib/dart_server.yaml

Index: sdk/lib/dart_server.yaml
diff --git a/sdk/lib/dart_server.yaml b/sdk/lib/dart_server.yaml
deleted file mode 100644
index e8932cb2a2af7a46f084b0de2e3dd2d137dcedb6..0000000000000000000000000000000000000000
--- a/sdk/lib/dart_server.yaml
+++ /dev/null
@@ -1,30 +0,0 @@
-# Copyright (c) 2017, 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.
-
-# Note: if you edit this file, you must also edit dart_server.json in this
-# directory:
-#
-#     ../../tools/yaml2json.py dart_server.yaml dart_server.json
-#
-# We currently have several different files that needs to be updated when
-# changing libraries, sources, and patch files.  See
-# https://github.com/dart-lang/sdk/issues/28836.
-
-libraries:
-  _builtin: ../../runtime/bin/builtin.dart
-  _internal: internal/internal.dart
-  _vmservice: vmservice/vmservice.dart
-  async: async/async.dart
-  collection: collection/collection.dart
-  convert: convert/convert.dart
-  core: core/core.dart
-  developer: developer/developer.dart
-  io: io/io.dart
-  isolate: isolate/isolate.dart
-  math: math/math.dart
-  mirrors: mirrors/mirrors.dart
-  nativewrappers: html/dartium/nativewrappers.dart
-  profiler: profiler/profiler.dart
-  typed_data: typed_data/typed_data.dart
-  vmservice_io: ../../runtime/bin/vmservice/vmservice_io.dart