Update google-client-loader.html

Author: mbleigh

google-client-loader.html

@@ -140,7 +140,7 @@
       ready: function() {
         this._loader = document.createElement('google-js-api');
 
-        if (!this.shadowRoot) { this.attachShadow(); }
+        if (!this.shadowRoot) { this.attachShadow({mode: 'open'}); }
         this.shadowRoot.appendChild(this._loader);
 
         this.listen(this._loader, 'js-api-load', '_loadClient');