[Polymer] Roll polymer to latest version

third_party/polymer/v1_0/components-chromium/paper-item/paper-item-shared-styles.html

 <!--
 @license
 Copyright (c) 2015 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
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+<link rel="import" href="../iron-flex-layout/iron-flex-layout.html">
+<link rel="import" href="../paper-styles/default-theme.html">
+<link rel="import" href="../paper-styles/color.html">
+
 <dom-module id="paper-item-shared-styles">
   <template>
     <style>
       :host {
         display: block;
+        position: relative;
         min-height: var(--paper-item-min-height, 48px);
         padding: 0px 16px;
       }
 
+      :host([hidden]) {
+        display: none !important;
+      }
+
       :host(.iron-selected) {
         font-weight: var(--paper-item-selected-weight, bold);
+
         @apply(--paper-item-selected);
       }
 
       :host([disabled]) {
         color: var(--paper-item-disabled-color, --disabled-text-color);
+
         @apply(--paper-item-disabled);
       }
 
       :host(:focus) {
         position: relative;
         outline: 0;
+
         @apply(--paper-item-focused);
       }
 
       :host(:focus):before {
         @apply(--layout-fit);
+
+        background: currentColor;
         content: '';
-        background: currentColor;
         opacity: var(--dark-divider-opacity);
         pointer-events: none;
 
         @apply(--paper-item-focused-before);
       }
     </style>
   </template>
 </dom-module>