MD History: Remove usage of iron-flex-layout from MD History

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/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/iron-flex-layout/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.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">
 <link rel="import" href="chrome://history/searched_label.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <dom-module id="history-synced-device-card">
   <template>
     <style include="shared-style">
       :host {
         @apply(--card-sizing);
         display: block;
         padding-bottom: var(--card-padding-between);
       }
 
       #card-heading {
-        @apply(--layout-justified);
         cursor: pointer;
+        justify-content: space-between;
       }
 
       #tab-item-list {
         padding: 8px 0;
       }
 
       #last-update-time {
         color: var(--secondary-text-color);
       }
 
       #right-buttons {
         -webkit-margin-end: 4px;
       }
 
       #menu-button {
         -webkit-margin-end: 8px;
       }
 
       #collapse {
         overflow: hidden;
       }
 
       #history-item-container {
         @apply(--card-box-shadow);
         background: #fff;
         border-radius: 2px;
       }
 
       #item-container {
-        @apply(--layout-center);
-        @apply(--layout-horizontal);
+        align-items: center;
+        display: flex;
         margin: 0 20px;
         min-height: var(--item-height);
       }
 
       #window-separator {
         background-color: var(--card-border-color);
         height: 1px;
         margin: 5px auto;
         width: 80%;
       }
@@ skipping 36 matching lines @@
             <div id="window-separator"
                 hidden$="[[!isWindowSeparatorIndex_(index, separatorIndexes)]]">
             </div>
           </template>
         </div>
       </iron-collapse>
     </div>
   </template>
   <script src="chrome://history/synced_device_card.js"></script>
 </dom-module>