dom-ui settings: Don't allow click sub-page closing when an overlay is visibl...

chrome/browser/resources/options/options_page.js

Index: chrome/browser/resources/options/options_page.js
===================================================================
--- chrome/browser/resources/options/options_page.js	(revision 71996)
+++ chrome/browser/resources/options/options_page.js	(working copy)
@@ -382,6 +382,10 @@
     if (!(topPage && topPage.parentPage))
       return;
 
+    // If an overlay is currently visible, do nothing.
+    if (this.isOverlayVisible_())
+      return;
+
     // If the click was within a subpage, do nothing.
     for (var level = 1; level <= 2; level++) {
       if ($('subpage-sheet-container-' + level).contains(event.target))