Revert "Build Observatory with runtime"

runtime/observatory/bin/shell.dart

-// Copyright (c) 2014, 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.
-
-library shell;
-
-import 'package:observatory/service_io.dart';
-
-import 'dart:io';
-
-// Simple demo for service_io library. Connects to localhost on the default
-// port, picks the first isolate, reads requests from stdin, and prints
-// results to stdout. Example session:
-// <<< prefix /isolates/1071334835
-// >>> /classes/40
-// <<< {"type":"Class","id":"classes\/40","name":"num","user_name":"num",...
-// >>> /objects/0
-// >>> {"type":"Array","class":{"type":"@Class","id":"classes\/62",...
-
-void repl(VM vm, String prefix, String lastResult) {
-  print(lastResult);
-  // TODO(koda): Use 'get' when ServiceObjects have more informative toString.
-  vm.getString(prefix + stdin.readLineSync()).then((String result) {
-    repl(vm, prefix, result);
-  });
-}
-
-void main() {
-  String addr = 'ws://localhost:8181/ws';
-  new WebSocketVM(new WebSocketVMTarget(addr)).get('vm').then((VM vm) {
-    Isolate isolate = vm.isolates.first;
-    String prefix = '${isolate.link}';
-    repl(vm, prefix, 'prefix $prefix');
-  });
-}