MD Settings: Lazy load the contents of the "advanced" settings.

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 840b2f41d522cb3e4d3f20ea5a3c2d38bed3e24e..d360e891f428705bfcc79d468745f7fb91989688 100644
--- a/chrome/browser/resources/settings/basic_page/basic_page.js
+++ b/chrome/browser/resources/settings/basic_page/basic_page.js
@@ -114,8 +114,10 @@ Polymer({
     ];
 
     if (this.pageVisibility.advancedSettings !== false) {
-      whenSearchDone.push(settings.getSearchManager().search(
-          query, assert(this.$$('#advancedPageTemplate').get())));
+      whenSearchDone.push(this.$$('#advancedPageTemplate').get().then(
+          function(advancedPage) {
+            return settings.getSearchManager().search(query, advancedPage);
+          }));
     }
 
     return Promise.all(whenSearchDone).then(function(requests) {