Update charted to 0.4.8 and roll

packages/observe/test/unique_message_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.
-
-/// Tests for some of the utility helper functions used by the compiler.
-library polymer.test.build.messages_test;
-
-import 'dart:mirrors';
-
-import 'package:unittest/unittest.dart';
-import 'package:code_transformers/messages/messages.dart' show Message;
-
-import 'package:observe/src/messages.dart' as p1;
-
-/// [p1] is accessed via mirrors, this comment prevents the analyzer from
-/// complaining about it.
-main() {
-  test('each message id is unique', () {
-    var seen = {};
-    int total = 0;
-    var mirrors = currentMirrorSystem();
-    var lib = mirrors.findLibrary(#observe.src.messages);
-    expect(lib, isNotNull);
-    lib.declarations.forEach((symbol, decl) {
-      if (decl is! VariableMirror) return;
-      var field = lib.getField(symbol).reflectee;
-      var name = MirrorSystem.getName(symbol);
-      if (field is! Message) return;
-      var id = field.id;
-      expect(seen.containsKey(id), isFalse, reason: 'Duplicate id `$id`. '
-          'Currently set for both `$name` and `${seen[id]}`.');
-      seen[id] = name;
-      total++;
-    });
-    expect(seen.length, total);
-  });
-}