MD Downloads: change a lowercased, no-ink button to an <a>

chrome/browser/resources/md_downloads/item.html

 <link rel="import" href="chrome://resources/html/action_link.html">
 <link rel="import" href="chrome://resources/html/cr.html">
 <link rel="import" href="chrome://resources/html/load_time_data.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-material/paper-material.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-progress/paper-progress.html">
 <link rel="import" href="chrome://downloads/action_service.html">
 <link rel="import" href="chrome://downloads/constants.html">
 <link rel="import" href="chrome://downloads/throttled_icon_loader.html">
@@ skipping 28 matching lines @@
 
         <div id="description">[[computeDescription_(data_.state, data_.danger_type, data_.file_name, data_.progress_status_text)]]</div>
 
         <template is="dom-if" if="[[showProgress_]]">
           <paper-progress id="progress"
               indeterminate$="[[isIndeterminate_(data_.percent)]]"
               value$="[[data_.percent]]"></paper-progress>
         </template>
 
         <div id="safe" class="controls" hidden$="[[isDangerous_]]">
-          <template is="dom-if" if="[[completelyOnDisk_]]">
-            <paper-button id="show" on-click="onShowClick_"
-                lowercase noink>[[i18n_.show]]</paper-button>
-          </template>
+          <a is="action-link" id="show" i18n-content="controlShowInFolder"
+              on-click="onShowClick_" hidden$="[[!completelyOnDisk_]]"></a>
           <template is="dom-if" if="[[data_.retry]]">
             <paper-button id="retry"
                 on-click="onRetryClick_">[[i18n_.retry]]</paper-button>
           </template>
           <template is="dom-if" if="[[isInProgress_]]">
             <paper-button id="pause"
                 on-click="onPauseClick_">[[i18n_.pause]]</paper-button>
           </template>
           <template is="dom-if" if="[[data_.resume]]">
             <paper-button id="resume"
@@ skipping 37 matching lines @@
       <div id="incognito" i18n-values="title:inIncognito"
           hidden$="[[!data_.otr]]"></div>
     </paper-material>
 
   </template>
   <link rel="import" type="css" href="chrome://resources/css/action_link.css">
   <link rel="import" type="css" href="chrome://downloads/shared_style.css">
   <link rel="import" type="css" href="chrome://downloads/item.css">
   <script src="chrome://downloads/item.js"></script>
 </dom-module>