MD History: remove underline/bgcolor change on :hover

chrome/browser/resources/md_history/history_list.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-list/iron-list.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-scroll-threshold/iron-scroll-threshold.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-item/paper-item.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_shared_menu/cr_shared_menu.html">
 <link rel="import" href="chrome://history/browser_service.html">
 <link rel="import" href="chrome://history/constants.html">
 <link rel="import" href="chrome://history/history_item.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <dom-module id="history-list">
   <template>
     <style include="shared-style">
       :host {
         display: block;
       }
 
       #infinite-list {
         height: 100%;
       }
 
       paper-item {
         -webkit-user-select: none;
         cursor: pointer;
         font: inherit;
         white-space: nowrap;
       }
 
-      paper-item:hover {

[tsergeant, 2016/07/21 07:12:17]

You lost a race with calamity, you'll need to rebase since this has now moved
into list_container.html

[Dan Beam, 2016/07/21 21:45:14]

Done.

-        background: #eaeaea;
-      }
-
       history-item {
         --history-item-padding-side: var(--card-padding-side);
       }
     </style>
     <div id="no-results" class="centered-message"
         hidden$="[[hasResults(historyData_.length)]]">
       {{noResultsMessage_(searchedTerm, querying)}}
     </div>
     <iron-list items="{{historyData_}}" as="item" id="infinite-list"
         hidden$="[[!hasResults(historyData_.length)]]">
@@ skipping 17 matching lines @@
       <paper-item id="menuMoreButton" on-tap="onMoreFromSiteTap_">
         $i18n{moreFromSite}
       </paper-item>
       <paper-item id="menuRemoveButton" on-tap="onRemoveFromHistoryTap_">
         $i18n{removeFromHistory}
       </paper-item>
     </cr-shared-menu>
   </template>
   <script src="chrome://history/history_list.js"></script>
 </dom-module>