[sync] Fix behavior of "Use default settings" / "Advanced" links

chrome/browser/resources/sync_setup_overlay.js

Index: chrome/browser/resources/sync_setup_overlay.js
diff --git a/chrome/browser/resources/sync_setup_overlay.js b/chrome/browser/resources/sync_setup_overlay.js
index 5070899f6b02f004d80638af3363b38e2c15be39..9e09337215f88fb191e2fd519362b652139af609 100644
--- a/chrome/browser/resources/sync_setup_overlay.js
+++ b/chrome/browser/resources/sync_setup_overlay.js
@@ -492,6 +492,7 @@ cr.define('options', function() {
       // Determine whether to bring the OK button into focus.
       var wasConfirmPageHidden = !this.confirmPageVisible_;
       this.confirmPageVisible_ = true;
+      this.customizePageVisible_ = false;
 
       $('confirm-sync-preferences').hidden = false;
       $('customize-sync-preferences').hidden = true;
@@ -588,6 +589,7 @@ cr.define('options', function() {
       // Determine whether to bring the OK button field into focus.
       var wasCustomizePageHidden = !this.customizePageVisible_;
       this.customizePageVisible_ = true;
+      this.confirmPageVisible_ = false;
 
       $('confirm-sync-preferences').hidden = true;
       $('customize-sync-preferences').hidden = false;