[MD settings] scroll to section find host

chrome/browser/resources/settings/settings_page/main_page_behavior.js

Index: chrome/browser/resources/settings/settings_page/main_page_behavior.js
diff --git a/chrome/browser/resources/settings/settings_page/main_page_behavior.js b/chrome/browser/resources/settings/settings_page/main_page_behavior.js
index 130a2881cdca9fca8e0c2f5934194daa3c515c59..6289c4d9e124cd407e923d52aaabe71392bf2abd 100644
--- a/chrome/browser/resources/settings/settings_page/main_page_behavior.js
+++ b/chrome/browser/resources/settings/settings_page/main_page_behavior.js
@@ -346,7 +346,8 @@ var RoutableBehaviorImpl = {
       if (!element)
         return;
 
-      if (element.parentNode.host.scrollHeight == 0) {
+      var host = findAncestor(element, function(n) { return n.host; }).host;
+      if (host.scrollHeight == 0) {
         setTimeout(pollForScrollHeight.bind(this), 100);
         return;
       }