[MD History] Use box-shadow to render card shadows everywhere.

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/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">
 <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 {
@@ skipping 21 matching lines @@
 
       #menu-button {
         -webkit-margin-end: 8px;
       }
 
       #collapse {
         overflow: hidden;
       }
 
       #history-item-container {
-        @apply(--card-box-shadow);
+        @apply(--shadow-elevation-2dp);
         background: #fff;
         border-radius: 2px;
       }
 
       #item-container {
         align-items: center;
         display: flex;
         margin: 0 20px;
         min-height: var(--item-height);
       }
@@ skipping 43 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>