Revert "Polymer elements added to third_party/polymer."

third_party/polymer/core-component-page/core-component-page.html

 <!--
 Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 
 <style>
@@ skipping 7104 matching lines @@
           name = path.pop();
         }
         return name || '';
       }
 
     });
 
   </script>
 
 </polymer-element>