[MD settings] restore side nav drop icons

chrome/browser/resources/settings/settings_menu/settings_menu.html

Index: chrome/browser/resources/settings/settings_menu/settings_menu.html
diff --git a/chrome/browser/resources/settings/settings_menu/settings_menu.html b/chrome/browser/resources/settings/settings_menu/settings_menu.html
index e1dee73fa682ab96f6dbfe8e5193c9700b7aab1f..01c123e74b33bb830162644ac45d36d68aaa6423 100644
--- a/chrome/browser/resources/settings/settings_menu/settings_menu.html
+++ b/chrome/browser/resources/settings/settings_menu/settings_menu.html
@@ -68,7 +68,7 @@
       }
     </style>
     <paper-menu name="root-menu">
-      <paper-submenu data-page="basic" id="basicPage">
+      <paper-submenu data-page="basic" id="basicPage" opened="{{basicOpened_}}">
         <div class="menu-trigger" data-section="" on-tap="openPage_">
           <span i18n-content="basicPageTitle"></span>
           <iron-icon icon="[[arrowState_(basicOpened_)]]" item-icon></iron-icon>
@@ -111,7 +111,8 @@
           </div>
         </paper-menu>
       </paper-submenu>
-      <paper-submenu id="advancedPage" data-page="advanced">
+      <paper-submenu id="advancedPage" data-page="advanced"
+          opened="{{advancedOpened_}}">
         <div class="menu-trigger" data-section="" on-tap="openPage_">
           <span i18n-content="advancedPageTitle"></span>
           <iron-icon icon="[[arrowState_(advancedOpened_)]]" item-icon>