Fix static warnings in custom_element package

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)
@@ skipping 286 matching lines @@
   Element get nextElementSibling => host.nextElementSibling;
 
   Element get offsetParent => host.offsetParent;
 
   Element get previousElementSibling => host.previousElementSibling;
 
   CssStyleDeclaration get style => host.style;
 
   String get tagName => host.tagName;
 
-  String get pseudo => host.pseudo;
-
-  void set pseudo(String value) {
-    host.pseudo = value;
-  }
-
   // Note: we are not polyfilling the shadow root here. This will be fixed when
   // we migrate to the JS Shadow DOM polyfills. You can still use getShadowRoot
   // to retrieve a node that behaves as the shadow root when Shadow DOM is not
   // enabled.
   ShadowRoot get shadowRoot => host.shadowRoot;
 
   void blur() { host.blur(); }
 
   void focus() { host.focus(); }
 
@@ skipping 107 matching lines @@
   get xtag => host.xtag;
 
   set xtag(value) { host.xtag = value; }
 
   Node append(Node e) => host.append(e);
 
   void appendText(String text) => host.appendText(text);
 
   void appendHtml(String html) => host.appendHtml(html);
 
-  String get regionOverset => host.regionOverset;
-
-  List<Range> getRegionFlowRanges() => host.getRegionFlowRanges();
-
-  void animate(List<Map> keyframes, [num duration]) =>
+  Animation animate(List<Map> keyframes, [num duration]) =>
       host.animate(keyframes, duration);
 
   // TODO(jmesserly): rename "created" to "onCreated".
   void onCreated() => created();
 
   Stream<Event> get onAbort => host.onAbort;
   Stream<Event> get onBeforeCopy => host.onBeforeCopy;
   Stream<Event> get onBeforeCut => host.onBeforeCut;
   Stream<Event> get onBeforePaste => host.onBeforePaste;
   Stream<Event> get onBlur => host.onBlur;
@@ skipping 19 matching lines @@
   Stream<KeyboardEvent> get onKeyUp => host.onKeyUp;
   Stream<Event> get onLoad => host.onLoad;
   Stream<MouseEvent> get onMouseDown => host.onMouseDown;
   Stream<MouseEvent> get onMouseEnter => host.onMouseEnter;
   Stream<MouseEvent> get onMouseLeave => host.onMouseLeave;
   Stream<MouseEvent> get onMouseMove => host.onMouseMove;
   Stream<Event> get onFullscreenChange => host.onFullscreenChange;
   Stream<Event> get onFullscreenError => host.onFullscreenError;
   Stream<Event> get onPaste => host.onPaste;
   Stream<Event> get onReset => host.onReset;
+  Stream<Event> get onResize => host.onResize;
   Stream<Event> get onScroll => host.onScroll;
   Stream<Event> get onSearch => host.onSearch;
   Stream<Event> get onSelect => host.onSelect;
   Stream<Event> get onSelectStart => host.onSelectStart;
   Stream<Event> get onSubmit => host.onSubmit;
   Stream<MouseEvent> get onMouseOut => host.onMouseOut;
   Stream<MouseEvent> get onMouseOver => host.onMouseOver;
   Stream<MouseEvent> get onMouseUp => host.onMouseUp;
   Stream<TouchEvent> get onTouchCancel => host.onTouchCancel;
   Stream<TouchEvent> get onTouchEnd => host.onTouchEnd;
   Stream<TouchEvent> get onTouchEnter => host.onTouchEnter;
   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');
   }
 }