MD Settings: Restore display: none for Bluetooth dialog.

chrome/browser/resources/settings/bluetooth_page/bluetooth_device_dialog.html

 <link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="chrome://resources/html/cr.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-selector/iron-selector.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.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-input/paper-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-spinner/paper-spinner.html">
 <link rel="import" href="/bluetooth_page/bluetooth_device_list_item.html">
@@ skipping 58 matching lines @@
       }
 
       /* .confirm indicates a confirmation passkey. */
       span.confirm {
         color: #999;
         font-size: 20px;
         font-weight: 600;  /* semibold */
         margin: 0 20px;
       }
     </style>
-    <dialog is="cr-dialog" id="dialog" class="layout vertical"
-        on-cancel="onDialogCanceled_">
+    <dialog is="cr-dialog" id="dialog" on-cancel="onDialogCanceled_">
       <div class="title">[[getTitle_(dialogId)]]</div>
       <div class="body">
         <template is="dom-if" if="[[isDialogType_(dialogId, 'addDevice')]]">
           <div id="dialogDeviceList" class="layout vertical"
               on-device-event="onDeviceEvent_">
             <span class="no-devices" hidden$="[[haveDevices_(deviceList)]]">
               $i18n{bluetoothNoDevices}
             </span>
             <iron-selector class="flex">
               <template is="dom-repeat" items="[[deviceList]]"
@@ skipping 69 matching lines @@
         </template>
         <template is="dom-if" if="[[isDialogType_(dialogId, 'connectError')]]">
           <paper-button  on-tap="close">$i18n{bluetoothDismiss}
           </paper-button>
         </template>
       </div>
     </dialog>
   </template>
   <script src="/bluetooth_page/bluetooth_device_dialog.js"></script>
 </dom-module>