MD Settings: clicking on the "Learn more" shouldn't select the sync passphrase option

chrome/browser/resources/settings/people_page/sync_page.js

 // Copyright 2015 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.
 
 (function() {
 
 /**
  * Names of the radio buttons which allow the user to choose their encryption
  * mechanism.
  * @enum {string}
@@ skipping 274 matching lines @@
    * @param {string} passphrase The passphrase input field value
    * @param {string} confirmation The passphrase confirmation input field value.
    * @return {boolean} Whether the passphrase save button should be enabled.
    * @private
    */
   isSaveNewPassphraseEnabled_: function(passphrase, confirmation) {
     return passphrase !== '' && confirmation !== '';
   },
 
   /**
+   * @param {!Event} e
+   * @private
+   */
+  onSyncLearnMoreTap_: function(e) {
+    e.stopPropagation();
+  },
+
+  /**
    * Sends the newly created custom sync passphrase to the browser.
    * @private
    */
   onSaveNewPassphraseTap_: function() {
     assert(this.creatingNewPassphrase_);
 
     // If a new password has been entered but it is invalid, do not send the
     // sync state to the API.
     if (!this.validateCreatedPassphrases_())
       return;
@@ skipping 121 matching lines @@
    * @private
    */
   onLearnMoreTap_: function(event) {
     // Stop the propagation of events, so that clicking on links inside
     // checkbox labels won't change the checkbox value.
     event.stopPropagation();
   }
 });
 
 })();