Replace deprecated iron-flex-layout/classes with iron-flex-layout-class in MD Settings

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

 <link rel="import" href="chrome://resources/html/i18n_behavior.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-flex-layout/classes/iron-flex-layout.html">
+<link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout-classes.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-list/iron-list.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.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-toggle-button/paper-toggle-button.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_pref_indicator.html">
 <link rel="import" href="/icons.html">
 <link rel="import" href="/settings_page/settings_animated_pages.html">
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="bluetooth_device_dialog.html">
 <link rel="import" href="bluetooth_device_list_item.html">
 
 <dom-module id="settings-bluetooth-page">
   <template>
-    <style include="settings-shared">
+    <style include="iron-flex iron-flex-alignment settings-shared">
       iron-icon {
         -webkit-margin-end: var(--iron-icon-spacing);
       }
 
       cr-expand-button {
         -webkit-margin-end: 10px;
       }
 
       #deviceList {
         max-height: 300px;
@@ skipping 63 matching lines @@
         error-message="[[errorMessage]]"
         on-device-event="onDeviceEvent_"
         on-response="onResponse_"
         pairing-device="[[pairingDevice]]"
         pairing-event="[[pairingEvent]]">
     </bluetooth-device-dialog>
 
   </template>
   <script src="bluetooth_page.js"></script>
 </dom-module>