MD Settings: Remove usage of deprecated iron-flex-layout.html, for CrOS.

chrome/browser/resources/settings/internet_page/internet_detail_page.html

 <link rel="import" href="chrome://resources/cr_elements/cr_expand_button/cr_expand_button.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/cr_elements/network/cr_network_icon.html">
 <link rel="import" href="chrome://resources/cr_elements/network/cr_onc_types.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_indicator.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_network_behavior.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_network_indicator.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-icon/iron-icon.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="../controls/settings_toggle_button.html">
 <link rel="import" href="../prefs/prefs.html">
 <link rel="import" href="../route.html">
 <link rel="import" href="internet_shared_css.html">
 <link rel="import" href="network_apnlist.html">
 <link rel="import" href="network_ip_config.html">
 <link rel="import" href="network_nameservers.html">
 <link rel="import" href="network_property_list.html">
 <link rel="import" href="network_proxy.html">
 <link rel="import" href="network_siminfo.html">
 
 <dom-module id="settings-internet-detail-page">
   <template>
-    <style include="internet-shared">
+    <style include="internet-shared iron-flex">
       :host {
         padding-bottom: 40px;
       }
 
       cr-network-icon {
         -webkit-padding-end: 8px;
       }
 
       iron-collapse {
         margin: 10px 0;
@@ skipping 257 matching lines @@
           <network-proxy editable prefs="{{prefs}}"
               on-proxy-change="onProxyChange_"
               network-properties="[[networkProperties]]">
           </network-proxy>
         </iron-collapse>
       </template>
     </template>
   </template>
   <script src="internet_detail_page.js"></script>
 </dom-module>