MD Setting: drop changes to background-color on :hover

chrome/browser/resources/settings/people_page/user_list.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="/settings_shared_css.html">
 
 <dom-module id="settings-user-list">
   <template>
     <style include="settings-shared">
       .soft-border {
         border: 1px solid #c4c4c4;
         border-radius: 2px;
       }
 
       .user {
         -webkit-padding-end: 8px;
         -webkit-padding-start: 20px;
         font-size: 0.75em;
         height: 34px;
       }
 
-      .user:hover {
-        background-color: #f0f0f0;
-      }
-
       .user-list {
         border: 1px solid gray;
         height: 160px;
         overflow-y: auto;
         padding: 10px 0;
       }
     </style>
     <div class="user-list soft-border">
       <template is="dom-repeat" items="[[users]]">
         <div class="user layout horizontal justified">
           <div class="layout vertical center-justified">[[item.email]]</div>
           <div class="close-button"
               hidden$="[[shouldHideCloseButton_(disabled, item.isOwner)]]">
             <paper-icon-button icon="cr:clear" class="clear-icon"
                 on-tap="removeUser_">
             </paper-icon-button>
           </div>
         </div>
       </template>
     </div>
   </template>
   <script src="user_list.js"></script>
 </dom-module>