Remove prematurely added test.

runtime/bin/vmservice/client/test/gc_test.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 gc_test;
-
-import 'test_helper.dart';
-import 'package:observatory/service_io.dart';
-import 'package:unittest/unittest.dart';
-
-import 'dart:io';
-
-// Expect at least this many GC events.
-int gcCountdown = 3;
-
-void onEvent(ServiceEvent event) {
-  if (event.eventType != 'GC') {
-    return;
-  }
-  if (--gcCountdown == 0) {
-    exit(0);
-  }
-}
-
-main() {
-  String script = 'gc_script.dart';
-  var process = new TestLauncher(script);
-  process.launch().then((port) {
-    String addr = 'ws://localhost:$port/ws';
-    new WebSocketVM(new WebSocketVMTarget(addr)).get('vm')
-        .then((VM vm) {
-      vm.events.stream.listen(onEvent);
-    });
-  });
-}