Updated charted DEP to 0.4.X

packages/charted/lib/selection/selection_scope.dart

 /*
  * Copyright 2014 Google Inc. All rights reserved.
  *
  * Use of this source code is governed by a BSD-style
  * license that can be found in the LICENSE file or at
  * https://developers.google.com/open-source/licenses/bsd
  */
 
 part of charted.selection;
 
 /** SelectionScope represents a scope for all the data and DOM operations. */
 class SelectionScope {
   Expando _associations = new Expando();
-  Expando<Map<String, Pair<Function, bool>>> _listeners = new Expando();
+  Expando<Map<String, Pair<EventListener, bool>>> _listeners = new Expando();
   Element _root;
 
   /** Creates a new selection scope with document as the root. */
   SelectionScope() {
     _root = document.documentElement;
   }
 
   /**
    * Creates a new selection scope with the first element matching
    * [selector] as the root.
@@ skipping 25 matching lines @@
 
   /*
    * Current event for which a callback is being called.
    */
   Event event;
 
   /** Returns the stored for the given [element]. */
   datum(Object element) => element == null ? null : _associations[element];
 
   /** Associates data to the given [element]. */
-  associate(Object element, datum) =>
+  associate(Element element, datum) =>
       datum != null ? _associations[element] = datum : null;
 
   /**
    * Creates a new [Selection] containing the first element matching
    * [selector].  If no element matches, the resulting selection will
    * have a null element.
    */
   Selection select(String selector) =>
       new _SelectionImpl.single(selector: selector, scope: this);
 
@@ skipping 16 matching lines @@
    * Appends a new element to [root] and creates a selection containing
    * the newly added element.
    */
   Selection append(String tag) {
     var element = Namespace.createChildElement(tag, _root);
     root.children.add(element);
 
     return selectElements([element]);
   }
 }