Fixes #2341: branch Polymer.dom to use native dom methods under Shado…

…w DOM for: appendChild, insertBefore, removeChild, replaceChild, cloneNode.

src/lib/dom-api.html

@@ -711,6 +711,15 @@
 
     } else {
 
+      var forwardMethods = ['cloneNode', 'appendChild', 'insertBefore', 
+      'removeChild', 'replaceChild'];
+
+      forwardMethods.forEach(function(name) {
+        DomApi.prototype[name] = function() {
+          return this.node[name].apply(this.node, arguments);
+        }
+      });
+
       DomApi.prototype.querySelectorAll = function(selector) {
         return Array.prototype.slice.call(this.node.querySelectorAll(selector));
       };
@@ -725,10 +734,6 @@
         }
       };
 
-      DomApi.prototype.cloneNode = function(deep) {
-        return this.node.cloneNode(deep);
-      }
-
       DomApi.prototype.importNode = function(externalNode, deep) {
         var doc = this.node instanceof Document ? this.node :
           this.node.ownerDocument;
@@ -788,11 +793,11 @@
 
       });
 
-      var forwards = ['parentNode', 'firstChild', 'lastChild', 'nextSibling',
-      'previousSibling', 'firstElementChild', 'lastElementChild',
+      var forwardProperties = ['parentNode', 'firstChild', 'lastChild', 
+      'nextSibling', 'previousSibling', 'firstElementChild', 'lastElementChild',
       'nextElementSibling', 'previousElementSibling'];
 
-      forwards.forEach(function(name) {
+      forwardProperties.forEach(function(name) {
         Object.defineProperty(DomApi.prototype, name, {
           get: function() {
             return this.node[name];