Enable MD storage manager by default.

chrome/browser/resources/settings/device_page/device_page.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 'settings-device-page' is the settings page for device and
  * peripheral settings.
  */
 Polymer({
   is: 'settings-device-page',
@@ skipping 24 matching lines @@
     },
 
     /** @private */
     stylusAllowed_: {
       type: Boolean,
       value: function() {
         return loadTimeData.getBoolean('stylusAllowed');
       },
       readOnly: true,
     },
-
-    /** @private */
-    showStorageManager_: {
-      type: Boolean,
-      value: function() {
-        return loadTimeData.getBoolean('showStorageManager');
-      },
-      readOnly: true,
-    },
   },
 
   observers: [
     'pointersChanged_(hasMouse_, hasTouchpad_)',
   ],
 
   ready: function() {
     cr.addWebUIListener('has-mouse-changed', this.set.bind(this, 'hasMouse_'));
     cr.addWebUIListener(
         'has-touchpad-changed', this.set.bind(this, 'hasTouchpad_'));
@@ skipping 85 matching lines @@
    * Leaves the pointer subpage if all pointing devices are detached.
    * @private
    */
   checkPointerSubpage_: function() {
     if (!this.hasMouse_ && !this.hasTouchpad_ &&
         settings.getCurrentRoute() == settings.Route.POINTERS) {
       settings.navigateTo(settings.Route.DEVICE);
     }
   },
 });