MD Settings: rework how advanced UI shows

chrome/browser/resources/settings/settings_main/settings_main.html

Index: chrome/browser/resources/settings/settings_main/settings_main.html
diff --git a/chrome/browser/resources/settings/settings_main/settings_main.html b/chrome/browser/resources/settings/settings_main/settings_main.html
index 4ca98a267b203e99fe51da022e0b5b616c9d173c..03f8d74913de5e68bf3a4c4758ca22489025c477 100644
--- a/chrome/browser/resources/settings/settings_main/settings_main.html
+++ b/chrome/browser/resources/settings/settings_main/settings_main.html
@@ -78,11 +78,10 @@
           showPages_.basic, hasExpandedSection_, inSearchMode_)]]">
         <div id="toggleSpacer"></div>
         <h2 id="toggleContainer">
-          <paper-button id="advancedToggle" on-tap="toggleAdvancedPage_" toggles
-              active="[[advancedToggleExpanded_]]"
-              aria-active-attribute="aria-expanded">
+          <paper-button id="advancedToggle" active="{{advancedToggleExpanded}}"
+              aria-active-attribute="aria-expanded" toggles>
             <span>$i18n{advancedPageTitle}</span>
-            <iron-icon icon="[[arrowState_(advancedToggleExpanded_)]]">
+            <iron-icon icon="[[arrowState_(advancedToggleExpanded)]]">
             </iron-icon>
           </paper-button>
         </h2>