Remove Polymer 0.5.

third_party/polymer/components/core-item/core-item.css

-/*
-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
-*/
-
-:host {
-  display: block;
-  position: relative;
-  min-height: 40px;
-  white-space: nowrap;
-}
-
-:host(.font-scalable) {
-  min-height: 2.5em;
-}
-
-:host(.core-selected) {
-  font-weight: bold;
-}
-
-#icon {
-  margin: 0 16px 0 4px;
-}
-
-:host(.font-scalable) #icon {
-  margin: 0 1em 0 0.25em;
-  height: 1.5em;
-  width: 1.5em;
-}
-
-polyfill-next-selector { content: ':host > a'; }
-::content > a {
-  position: absolute;
-  top: 0;
-  right: 0;
-  bottom: 0;
-  left: 0;
-  /* IE10 styling to ensure link is clickable. Cannot be completely
-  transparent or minifiers change it to `transparent` which does not work. */
-  background-color: rgba(0, 0, 0, 0.000001);
-}