From 8eada875428b09819e3a6e4e38b2f077ae744d6f Mon Sep 17 00:00:00 2001
From: Steven Orvell <sorvell@google.com>
Date: Wed, 26 Aug 2015 12:19:56 -0700
Subject: [PATCH] remove unneeded protection code for extends.

---
 src/lib/polymer-bootstrap.html | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/src/lib/polymer-bootstrap.html b/src/lib/polymer-bootstrap.html
index cf09cea364..3386d515bf 100644
--- a/src/lib/polymer-bootstrap.html
+++ b/src/lib/polymer-bootstrap.html
@@ -34,15 +34,10 @@
       // Polymer.Base is now chained to factory.prototype, and for IE10 compat
       // this may have resulted in a new prototype being created
       prototype = factory.prototype;
-      // native Custom Elements treats 'undefined' extends property
-      // as valued, the property must not exist to be ignored
-      // TODO(sjmiles): Custom Elements no longer has the above behavior
       var options = {
-        prototype: prototype
+        prototype: prototype,
+        extends: prototype.extends
       };
-      if (prototype.extends) {
-        options.extends = prototype.extends;
-      }
       Polymer.telemetry._registrate(prototype);
       document.registerElement(prototype.is, options);
       return factory;