Remove unused function |attach_()| in sync_setup_overlay.js

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;
 
   // Variable to track if a captcha challenge was issued. If this gets set to
   // true, it stays that way until we are told about successful login from
   // the browser.  This means subsequent errors (like invalid password) are
@@ skipping 498 matching lines @@
       } else {
         // We only show the 'Use Default' link if we're not prompting for an
         // existing passphrase.
         var self = this;
         this.animateDisableLink_($('use-default-link'), false, function() {
           self.showSyncEverythingPage_();
         });
       }
     },
 
-    attach_: function() {
-      chrome.send('SyncSetupAttachHandler');
-    },
-
     /**
      * Shows the appropriate sync setup page.
      * @param {string} page A page of the sync setup to show.
      * @param {object} args Data from the C++ to forward on to the right
      *     section.
      */
     showSyncSetupPage_: function(page, args) {
       this.setThrobbersVisible_(false);
 
       // Hide an existing visible overlay (ensuring the close button is not
@@ skipping 437 matching lines @@
 
   SyncSetupOverlay.showStopSyncingUI = function() {
     SyncSetupOverlay.getInstance().showStopSyncingUI_();
   };
 
   // Export
   return {
     SyncSetupOverlay: SyncSetupOverlay
   };
 });