Hide Night Light behind a flag

chrome/browser/resources/settings/device_page/display.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-display' is the settings subpage for display settings.
  */
 
 cr.define('settings.display', function() {
@@ skipping 63 matching lines @@
 
     /** @private */
     unifiedDesktopAvailable_: {
       type: Boolean,
       value: function() {
         return loadTimeData.getBoolean('unifiedDesktopAvailable');
       }
     },
 
     /** @private */
+    nightLightFeatureEnabled_: {
+      type: Boolean,
+      value: function() {
+        return loadTimeData.getBoolean('nightLightFeatureEnabled');
+      }
+    },
+
+    /** @private */
     unifiedDesktopMode_: {
       type: Boolean,
       value: false,
     },
   },
 
   /** @private {number} Selected mode index received from chrome. */
   currentSelectedModeIndex_: -1,
 
   /**
@@ skipping 424 matching lines @@
   },
 
   /** @private */
   setPropertiesCallback_: function() {
     if (chrome.runtime.lastError) {
       console.error(
           'setDisplayProperties Error: ' + chrome.runtime.lastError.message);
     }
   },
 });