MD Settings: convert paper-icon-button to paper-icon-button-light.

chrome/browser/resources/settings/site_settings/site_data_details_subpage.html

 <link rel="import" href="chrome://resources/cr_elements/cr_expand_button/cr_expand_button.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-collapse/iron-collapse.html">
-<link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
+<link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="../route.html">
 <link rel="import" href="../settings_shared_css.html">
 <link rel="import" href="site_settings_prefs_browser_proxy.html">
 
 <dom-module id="site-data-details-subpage">
   <template>
     <style include="settings-shared md-select">
       [first] {
         border-top: none;
       }
 
       .secondary,
       .start {
         -webkit-user-select: text;
         max-width: 100%;
         word-wrap: break-word;
       }
     </style>
     <template is="dom-repeat" items="[[entries_]]">
       <div class="settings-box" first$="[[!index]]">
         <div class="start">[[getEntryDescription_(item)]]</div>
         <cr-expand-button expanded="{{item.expanded_}}">
         </cr-expand-button>
-        <paper-icon-button data-id-path$="[[item.idPath]]" icon="cr:close"
-            on-tap="onRemove_">
-        </paper-icon-button>
+        <button is="paper-icon-button-light" data-id-path$="[[item.idPath]]"
+            class="icon-clear" on-tap="onRemove_">
+        </button>
       </div>
       <iron-collapse class="list-frame vertical-list"
           opened="[[item.expanded_]]">
         <template is="dom-repeat" items="[[getCookieNodes_(item)]]">
           <div class="list-item two-line">
             <div class="start">
               [[item.label]]
               <div class="secondary">[[item.content]]</div>
             </div>
           </div>
         </template>
       </iron-collapse>
     </template>
   </template>
   <script src="cookie_info.js"></script>
   <script src="cookie_tree_node.js"></script>
   <script src="site_data_details_subpage.js"></script>
 </dom-module>