[MD settings] expand subpages to 100%

chrome/browser/resources/settings/basic_page/basic_page.js

Index: chrome/browser/resources/settings/basic_page/basic_page.js
diff --git a/chrome/browser/resources/settings/basic_page/basic_page.js b/chrome/browser/resources/settings/basic_page/basic_page.js
index 82e9add52da31876ba558caf8c8a3136501948d6..02074331ff3f9561c6e90bcabdecea75c994c4d0 100644
--- a/chrome/browser/resources/settings/basic_page/basic_page.js
+++ b/chrome/browser/resources/settings/basic_page/basic_page.js
@@ -102,7 +102,7 @@ Polymer({
 
     if (this.pageVisibility.advancedSettings !== false) {
       assert(whenSearchDone === settings.getSearchManager().search(
-          query, assert(this.$.advancedPageTemplate.get())));
+          query, assert(this.$$('#advancedPageTemplate').get())));
     }
 
     return whenSearchDone;
@@ -136,8 +136,11 @@ Polymer({
    * @private
    */
   advancedToggleExpandedChanged_: function() {
-    if (this.advancedToggleExpanded)
-      this.$.advancedPageTemplate.get();
+    if (this.advancedToggleExpanded) {
+      this.async(function() {
+        this.$$('#advancedPageTemplate').get();
+      }.bind(this));
+    }
   },
 
   /**