Revert "Unify dart:isolate."

lib/isolate/isolate_compiler.dart

+// Copyright (c) 2012, 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.
+
+
+// Dart isolate's API for the dartc compiler (only used for type checking in the
+// dart editor, but not for code generation).
+#library("dart:isolate");
+
+#source("isolate_api.dart");
+#source("timer.dart");
+#source("timer_hook.dart");
+
+SendPort _spawnFunction(void topLevelFunction()) {
+  throw new NotImplementedException();
+}
+
+SendPort _spawnUri(String uri) {
+  throw new NotImplementedException();
+}
+
+ReceivePort _port = null;
+
+class _ReceivePortFactory {
+  factory ReceivePort() {
+    throw new NotImplementedException();
+  }
+}