Update charted to 0.4.8 and roll

packages/web_components/lib/ShadowDOM.js

 /**
  * @license
  * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
  * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
  * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
  * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-// @version 0.7.21
+// @version 0.7.23
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
     var counter = Date.now() % 1e9;
     var WeakMap = function() {
       this.name = "__st" + (Math.random() * 1e9 >>> 0) + (counter++ + "__");
     };
     WeakMap.prototype = {
       set: function(key, value) {
         var entry = key[this.name];
@@ skipping 137 matching lines @@
       this.__impl4cf1e782hg__[name] = v;
     };
   }
   function getMethod(name) {
     return hasEval && isIdentifierName(name) ? new Function("return this.__impl4cf1e782hg__." + name + ".apply(this.__impl4cf1e782hg__, arguments)") : function() {
       return this.__impl4cf1e782hg__[name].apply(this.__impl4cf1e782hg__, arguments);
     };
   }
   function getDescriptor(source, name) {
     try {
+      if (source === window && name === "showModalDialog") {
+        return dummyDescriptor;
+      }
       return Object.getOwnPropertyDescriptor(source, name);
     } catch (ex) {
       return dummyDescriptor;
     }
   }
   var isBrokenSafari = function() {
     var descr = Object.getOwnPropertyDescriptor(Node.prototype, "nodeType");
     return descr && !descr.get && !descr.set;
   }();
   function installProperty(source, target, allowMethod, opt_blacklist) {
@@ skipping 4306 matching lines @@
     if (!nativeConstructor) return;
     var element = document.createElement(tagName);
     var wrapperConstructor = element.constructor;
     window[nativeConstructorName] = wrapperConstructor;
   }
   Object.keys(elements).forEach(overrideConstructor);
   Object.getOwnPropertyNames(scope.wrappers).forEach(function(name) {
     window[name] = scope.wrappers[name];
   });
 })(window.ShadowDOMPolyfill);