Revert "Build Observatory with runtime"

runtime/observatory/test/mirror_references_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 vm_references_test;
-
-import 'dart:async';
-import 'dart:mirrors';
-import 'package:observatory/service_io.dart';
-import 'package:unittest/unittest.dart';
-import 'test_helper.dart';
-
-class Foo { }
-
-Foo foo;
-var /*MirrorReference*/ ref;
-
-void script() {
-  foo = new Foo();
-  ClassMirror fooClassMirror = reflectClass(Foo);
-  InstanceMirror fooClassMirrorMirror = reflect(fooClassMirror);
-  LibraryMirror libmirrors = fooClassMirrorMirror.type.owner;
-  ref = reflect(fooClassMirror).getField(MirrorSystem.getSymbol('_reflectee', libmirrors)).reflectee;
-}
-
-var tests = [
-
-(Isolate isolate) =>
-  isolate.rootLib.load().then((Library lib) {
-    Field fooField = lib.variables.singleWhere((v) => v.name == 'foo');
-    Instance foo = fooField.value;
-    Field refField = lib.variables.singleWhere((v) => v.name == 'ref');
-    Instance ref = refField.value;
-
-    expect(foo.isMirrorReference, isFalse);
-    expect(ref.isMirrorReference, isTrue);
-    expect(ref.referent, isNull);
-    return ref.load().then((Instance loadedRef) {
-      expect(loadedRef.referent, isNotNull);
-      expect(loadedRef.referent.name, equals('Foo'));
-      expect(loadedRef.referent, equals(foo.clazz));
-    });
-  }),
-
-];
-
-main(args) => runIsolateTests(args, tests, testeeBefore: script);