extensions: fix focus management for all dialogs (not just options).

ui/webui/resources/js/cr/ui/page_manager/page_manager.js

Index: ui/webui/resources/js/cr/ui/page_manager/page_manager.js
diff --git a/ui/webui/resources/js/cr/ui/page_manager/page_manager.js b/ui/webui/resources/js/cr/ui/page_manager/page_manager.js
index 8220c2cc7af419e126e9f9563c776a6aad52fe50..ae6283a8c019a587914e1b56054ab7686f44454e 100644
--- a/ui/webui/resources/js/cr/ui/page_manager/page_manager.js
+++ b/ui/webui/resources/js/cr/ui/page_manager/page_manager.js
@@ -3,8 +3,6 @@
 // found in the LICENSE file.
 
 cr.define('cr.ui.pageManager', function() {
-  /** @const */ var FocusOutlineManager = cr.ui.FocusOutlineManager;
-
   /**
    * PageManager contains a list of root Page and overlay Page objects and
    * handles "navigation" by showing and hiding these pages and overlays. On
@@ -56,7 +54,7 @@ cr.define('cr.ui.pageManager', function() {
     initialize: function(defaultPage) {
       this.defaultPage_ = defaultPage;
 
-      FocusOutlineManager.forDocument(document);
+      cr.ui.FocusOutlineManager.forDocument(document);
       document.addEventListener('scroll', this.handleScroll_.bind(this));
 
       // Trigger the scroll handler manually to set the initial state.
@@ -500,11 +498,10 @@ cr.define('cr.ui.pageManager', function() {
       // Change focus to the overlay if any other control was focused by
       // keyboard before. Otherwise, no one should have focus.
       if (document.activeElement != document.body) {
-        if (FocusOutlineManager.forDocument(document).visible) {
+        if (cr.ui.FocusOutlineManager.forDocument(document).visible)
           overlay.focus();
-        } else if (!overlay.pageDiv.contains(document.activeElement)) {
+        if (!overlay.pageDiv.contains(document.activeElement))
           document.activeElement.blur();
-        }
       }
 
       if ($('search-field') && $('search-field').value == '') {