Converted Observatory source-link & script-ref elements

runtime/observatory/lib/src/repositories/script.dart

+// Copyright (c) 2016, 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.
+
+part of repositories;
+
+class ScriptRepository implements M.ScriptRepository {
+  final S.Isolate isolate;
+
+  ScriptRepository(this.isolate);
+
+  Future<M.Script> get(String id) async {
+    return (await isolate.getObject(id)) as M.Script;
+  }
+}