Rework quick unlock settings to follow new specs.

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

-// Copyright 2016 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
- * Contains utilities for verifying the user has entered an account password.
- */
-
-/** @polymerBehavior */
-var QuickUnlockPasswordDetectBehavior = {
-  properties: {
-    setModes: Object
-  },
-
-  /**
-   * Verifies that there is an account password available for the
-   * chrome.quickUnlockPrivate.setModes call. If there is no password, this will
-   * redirect to the authenticate screen.
-   */
-  askForPasswordIfUnset: function() {
-    if (!this.setModes)
-      settings.navigateTo(settings.Route.QUICK_UNLOCK_AUTHENTICATE);
-  }
-};