MD History: Update history-toolbar to use icon-button-light

chrome/browser/resources/md_history/synced_device_card.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/cr/ui/focus_row.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-collapse/iron-collapse.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/shadow.html">
 <link rel="import" href="chrome://resources/html/icon.html">
 <link rel="import" href="chrome://history/browser_service.html">
 <link rel="import" href="chrome://history/constants.html">
@@ skipping 30 matching lines @@
       }
 
       #device-name {
         overflow: hidden;
         padding-right: 3px;
         text-overflow: ellipsis;
       }
 
       #right-buttons {
         -webkit-margin-end: 4px;
+        color: var(--secondary-text-color);
       }
 
       #menu-button {
         -webkit-margin-end: 8px;
       }
 
       #collapse {
         overflow: hidden;
       }
 
@@ skipping 57 matching lines @@
             <div class="window-separator"
                 hidden$="[[!isWindowSeparatorIndex_(index, separatorIndexes)]]">
             </div>
           </template>
         </div>
       </iron-collapse>
     </div>
   </template>
   <script src="chrome://history/synced_device_card.js"></script>
 </dom-module>