Call preventDefault in all on-tap events that show a dialog.

chrome/browser/resources/settings/people_page/people_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.
 
 /**
  * @fileoverview
  * 'settings-people-page' is the settings page containing sign-in settings.
  */
 Polymer({
   is: 'settings-people-page',
@@ skipping 317 matching lines @@
   /** @private */
   onConfigureLockTap_: function() {
     settings.navigateTo(settings.Route.LOCK_SCREEN);
   },
 
   /** @private */
   onEasyUnlockSetupTap_: function() {
     this.easyUnlockBrowserProxy_.startTurnOnFlow();
   },
 
-  /** @private */
-  onEasyUnlockTurnOffTap_: function() {
+  /**
+   * @param {Event} e The polymer event.

[dpapad, 2016/12/07 18:17:06]

Nit: !Event here and elsewhere.

[hcarmona, 2016/12/07 18:52:18]

Done.

+   * @private
+   */
+  onEasyUnlockTurnOffTap_: function(e) {
+    e.preventDefault();
     this.showEasyUnlockTurnOffDialog_ = true;
   },
 
   /** @private */
   onEasyUnlockTurnOffDialogClose_: function() {
     this.showEasyUnlockTurnOffDialog_ = false;
   },
 </if>
 
   /** @private */
@@ skipping 113 matching lines @@
 
   /**
    * @param {!settings.SyncStatus} syncStatus
    * @return {boolean} Whether to show the "Sign in to Chrome" button.
    * @private
    */
   showSignin_: function(syncStatus) {
     return !!syncStatus.signinAllowed && !syncStatus.signedIn;
   },
 });