Merge pull request #112 from webcomponents/remove-attachShadow-warning

Remove warning about `Element.prototype.attachShadow` not existing.

Author: dfreedm

custom-elements.min.js

@@ -22,8 +22,6 @@ export default function(internals) {
         this.__CE_shadowRoot = shadowRoot;
         return shadowRoot;
       });
-  } else {
-    console.warn('Custom Elements: `Element#attachShadow` was not patched.');
   }