Add @proxy to annotations.dart - remove package:meta.

pkg/custom_element/lib/custom_element.dart

 // Copyright (c) 2013, 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.
 
 /**
  * Custom DOM elements.
  *
  * This library provides access to the Polymer project's
  * [Custom Elements]
  * (http://www.polymer-project.org/platform/custom-elements.html)
  * API, which lets you define your own elements. With custom elements, you
  * associate code with custom tag names, and then use those custom tag names
  * as you would any standard tag. For more information, see the
  * [Polymer.dart homepage](https://www.dartlang.org/polymer-dart/) and its
  * [custom element example]
  * (https://www.dartlang.org/polymer-dart/#custom-elements).
  */
 library custom_element;
 
 import 'dart:async';
 import 'dart:html';
-import 'package:meta/meta.dart';
 import 'src/custom_tag_name.dart';
 
 /**
  * *Deprecated* -- do not use. Extend [HtmlElement] and use
  * [document.register] instead. If running on a browser without native
  * document.register, you can add the polyfill script to your page:
  *
  *     <script src="packages/custom_element/custom-elements.debug.js"></script>
  *
  * You can also use "custom-elements.min.js" for the minified version.
@@ skipping 468 matching lines @@
   Stream<TouchEvent> get onTouchLeave => host.onTouchLeave;
   Stream<TouchEvent> get onTouchMove => host.onTouchMove;
   Stream<TouchEvent> get onTouchStart => host.onTouchStart;
   Stream<TransitionEvent> get onTransitionEnd => host.onTransitionEnd;
 
   // TODO(sigmund): do the normal forwarding when dartbug.com/7919 is fixed.
   Stream<WheelEvent> get onMouseWheel {
     throw new UnsupportedError('onMouseWheel is not supported');
   }
 }