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

chrome/browser/resources/sync_setup_overlay.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('options', function() {
   /** @const */ var OptionsPage = options.OptionsPage;
 
   // True if the synced account uses a custom passphrase.
   var usePassphrase_ = false;
 
@@ skipping 474 matching lines @@
 
     showTimeoutPage_: function() {
       this.resetPage_('sync-setup-timeout');
       $('sync-setup-timeout').hidden = false;
     },
 
     showSyncEverythingPage_: 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;
 
       // Reset the selection to 'Sync everything'.
       $('sync-select-datatypes').selectedIndex = 0;
 
       // The default state is to sync everything.
       this.setDataTypeCheckboxes_(DataTypeSelection.SYNC_EVERYTHING);
 
@@ skipping 76 matching lines @@
     /**
      * Displays the advanced sync setting dialog, and pre-selects either the
      * "Sync everything" or the "Choose what to sync" drop-down menu item.
      * @param {cr.DataTypeSelection} index Index of item to pre-select.
      * @private
      */
     showCustomizePage_: function(args, index) {
       // 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;
 
       $('sync-custom-passphrase-container').hidden = false;
       $('sync-new-encryption-section-container').hidden = false;
       $('customize-sync-encryption-new').hidden = false;
 
       $('sync-existing-passphrase-container').hidden = true;
 
@@ skipping 191 matching lines @@
 
   SyncSetupOverlay.showStopSyncingUI = function() {
     SyncSetupOverlay.getInstance().showStopSyncingUI_();
   };
 
   // Export
   return {
     SyncSetupOverlay: SyncSetupOverlay
   };
 });