update elements and fix some bugs

lib/src/iron-selector/iron-multi-selectable.html

Index: lib/src/iron-selector/iron-multi-selectable.html
diff --git a/lib/src/iron-selector/iron-multi-selectable.html b/lib/src/iron-selector/iron-multi-selectable.html
index ba9455ded233d8b00081e14c2bf00e16dab6959e..f6a153156ea8d3740cd8dd2e52ca09c134a87582 100644
--- a/lib/src/iron-selector/iron-multi-selectable.html
+++ b/lib/src/iron-selector/iron-multi-selectable.html
@@ -103,9 +103,9 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       var i = this.selectedValues.indexOf(value);
       var unselected = i < 0;
       if (unselected) {
-        this.selectedValues.push(value);
+        this.push('selectedValues',value);
       } else {
-        this.selectedValues.splice(i, 1);
+        this.splice('selectedValues',i,1);
       }
       this._selection.setItemSelected(this._valueToItem(value), unselected);
     }