Revert "Build Observatory with runtime"

runtime/observatory/test/allocations_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 allocations_test;
-
-import 'package:observatory/service_io.dart';
-import 'package:unittest/unittest.dart';
-import 'test_helper.dart';
-
-class Foo {
-}
-List<Foo> foos;
-
-void script() {
-  foos = [new Foo(), new Foo(), new Foo()];
-}
-
-var tests = [
-
-(Isolate isolate) =>
-  isolate.rootLib.load().then((Library lib) {
-    expect(lib.url.endsWith('allocations_test.dart'), isTrue);
-    expect(lib.classes.length, equals(1));
-    return lib.classes.first.load().then((Class fooClass) {
-      expect(fooClass.name, equals('Foo'));
-      expect(fooClass.newSpace.accumulated.instances +
-             fooClass.oldSpace.accumulated.instances, equals(3));
-    });
-}),
-
-];
-
-main(args) => runIsolateTests(args, tests, testeeBefore: script);