MD Settings: Remove usage of paper-material.

chrome/browser/resources/settings/device_page/display_layout.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-resizable-behavior/iron-resizable-behavior.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-material/paper-material-shared-styles.html">
 <link rel="import" href="drag_behavior.html">
 <link rel="import" href="layout_behavior.html">
 <link rel="import" href="../settings_shared_css.html">
 
 <dom-module id="display-layout">
   <template>
-    <style include="settings-shared">
+    <style include="settings-shared paper-material-shared-styles">
       /* Use relative position with no offset so that display divs (children),
          which have absolute positions, are offset from the displayArea div. */
       #displayArea {
         height: 100%;
         overflow: hidden;
         position: relative;
         width: 100%;
       }
 
       /* Note: the size of the border / box shadow affects the style generated
@@ skipping 23 matching lines @@
       }
       .highlight-right {
         border-right: var(--google-blue-700) solid 1px;
       }
       .highlight-top {
         border-top: var(--google-blue-700) solid 1px;
       }
       .highlight-bottom {
         border-bottom: var(--google-blue-700) solid 1px;
       }
+
+      .display.elevate {
+        @apply(--shadow-elevation-2dp);
+      }
     </style>
     <div id="displayArea" on-iron-resize="calculateVisualScale_">
       <template is="dom-repeat" items="[[displays]]">
         <div id="_mirror_[[item.id]]" class="display mirror"

[dpapad, 2017/05/20 00:38:33]

It is unclear to me whether this should also have the box-shadow. It did not
have it before my CL, so I am leaving it as-is, but it seems odd that it does
not.

[stevenjb, 2017/05/22 22:27:56]

There were some styling changes done here that I was not involved in. I will
have Alan go over them.

             hidden$="[[!mirroring]]"
             style$="[[getMirrorDivStyle_(item.id, item.bounds, visualScale)]]">
         </div>
       </template>
       <template is="dom-repeat" items="[[displays]]">
-        <paper-material id="_[[item.id]]" class="display" elevation="1"
+        <div id="_[[item.id]]" class="display elevate"
             draggable="[[dragEnabled]]" on-tap="onSelectDisplayTap_"
             style$="[[getDivStyle_(item.id, item.bounds, visualScale)]]"
             selected$="[[isSelected_(item, selectedDisplay)]]">
           [[item.name]]
-        </paper-material>
+        </div>
       </template>
     </div>
   </template>
   <script src="display_layout.js"></script>
 </dom-module>