Roll Observatory packages and add a roll script

observe/lib/src/messages.dart

Index: observe/lib/src/messages.dart
diff --git a/observe/lib/src/messages.dart b/observe/lib/src/messages.dart
deleted file mode 100644
index ed12162626845b65cd22165b0a05357bc495bbf4..0000000000000000000000000000000000000000
--- a/observe/lib/src/messages.dart
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@@ -1,51 +0,0 @@
-// 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.
-
-/// Contains all warning messages produced by the observe transformer.
-library observe.src.messages;
-
-import 'package:code_transformers/messages/messages.dart';
-
-const NO_OBSERVABLE_ON_LIBRARY = const MessageTemplate(
-    const MessageId('observe', 1),
-    '@observable on a library no longer has any effect. '
-    'Instead, annotate individual fields as @observable.',
-    '`@observable` not supported on libraries',
-    _COMMON_MESSAGE_WHERE_TO_USE_OBSERVABLE);
-
-const NO_OBSERVABLE_ON_TOP_LEVEL = const MessageTemplate(
-    const MessageId('observe', 2),
-    'Top-level fields can no longer be observable. '
-    'Observable fields must be in observable objects.',
-    '`@observable` not supported on top-level fields',
-    _COMMON_MESSAGE_WHERE_TO_USE_OBSERVABLE);
-
-const NO_OBSERVABLE_ON_CLASS = const MessageTemplate(
-    const MessageId('observe', 3),
-    '@observable on a class no longer has any effect. '
-    'Instead, annotate individual fields as @observable.',
-    '`@observable` not supported on classes',
-    _COMMON_MESSAGE_WHERE_TO_USE_OBSERVABLE);
-
-const NO_OBSERVABLE_ON_STATIC_FIELD = const MessageTemplate(
-    const MessageId('observe', 4),
-    'Static fields can no longer be observable. '
-    'Observable fields must be in observable objects.',
-    '`@observable` not supported on static fields',
-    _COMMON_MESSAGE_WHERE_TO_USE_OBSERVABLE);
-
-const REQUIRE_OBSERVABLE_INTERFACE = const MessageTemplate(
-    const MessageId('observe', 5),
-    'Observable fields must be in observable objects. '
-    'Change this class to extend, mix in, or implement Observable.',
-    '`@observable` field not in an `Observable` class',
-    _COMMON_MESSAGE_WHERE_TO_USE_OBSERVABLE);
-
-const String _COMMON_MESSAGE_WHERE_TO_USE_OBSERVABLE = '''
-Only instance fields on `Observable` classes can be observable,
-and you must explicitly annotate each observable field as `@observable`.
-
-Support for using the `@observable` annotation in libraries, classes, and
-elsewhere is deprecated.
-''';