Kill service_test.cc tests in favor of dart tests for the service protocol.

runtime/observatory/tests/service/get_instances_rpc_test.dart

+// Copyright (c) 2015, 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.
+// VMOptions=--compile-all --error_on_bad_type --error_on_bad_override
+
+import 'dart:async';
+
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+
+import 'test_helper.dart';
+
+class _TestClass {
+  _TestClass(this.x, this.y);
+  var x;
+  var y;
+}
+
+var global;
+
+void warmup() {
+  global = new _TestClass(new _TestClass(1, 2), null);
+}
+
+eval(Isolate isolate, String expression) async {
+  Map params = {
+    'targetId': isolate.rootLib.id,
+    'expression': expression,
+  };
+  return await isolate.invokeRpcNoUpgrade('eval', params);
+}
+
+var tests = [
+  (Isolate isolate) async {
+    var obj = await eval(isolate, 'global');
+    var params = {
+      'classId': obj['class']['id'],
+      'limit': 4,
+    };
+    var result = await isolate.invokeRpcNoUpgrade('_getInstances', params);
+    expect(result['type'], equals('InstanceSet'));
+    expect(result['totalCount'], equals(2));
+    expect(result['samples'].length, equals(2));
+    expect(result['samples'][0]['type'], equals('@Instance'));
+
+    // Limit is respected.
+    params = {
+      'classId': obj['class']['id'],
+      'limit': 1,
+    };
+    result = await isolate.invokeRpcNoUpgrade('_getInstances', params);
+    expect(result['type'], equals('InstanceSet'));
+    expect(result['totalCount'], equals(2));
+    expect(result['samples'].length, equals(1));
+    expect(result['samples'][0]['type'], equals('@Instance'));
+  },
+];
+
+main(args) async => runIsolateTests(args, tests, testeeBefore:warmup);