Enable strict flags for all service tests

runtime/observatory/test/native_metrics_test.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file

[turnidge, 2015/03/27 17:25:18]

2015

[Cutch, 2015/03/27 23:32:00]

Done.

+// 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.
+// VMOptions=--compile-all --error_on_bad_type --error_on_bad_override --checked
+
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 
 import 'dart:profiler';
 
 void script() {
   var counter = new Counter('a.b.c', 'description');
   Metrics.register(counter);
   counter.value = 1234.5;
@@ skipping 21 matching lines @@
 (Isolate isolate) =>
     isolate.invokeRpc('getIsolateMetric',
                       { 'metricId': 'metrics/native/doesnotexist' })
           .then((DartError err) {
     expect(err is DartError, isTrue);
   }),
 
 ];
 
 main(args) => runIsolateTests(args, tests, testeeBefore: script);