Only enable mirroring for 2 displays

chrome/browser/resources/options/browser_options.js

 // Copyright (c) 2012 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.
 
 cr.exportPath('options');
 
 /**
  * @typedef {{actionLinkText: (string|undefined),
  *            childUser: (boolean|undefined),
  *            hasError: (boolean|undefined),
@@ skipping 1719 matching lines @@
     /**
      * Enables or disables the Manage SSL Certificates button.
      * @private
      */
     enableCertificateButton_: function(enabled) {
       $('certificatesManageButton').disabled = !enabled;
     },
 
     /**
      * Enables or disables the Chrome OS display settings button and overlay.
-     * @param {boolean} enabled
-     * @param {boolean} showUnifiedDesktop
-     * @param {boolean} multiDisplayLayout
+     * @param {boolean} uiEnabled
+     * @param {boolean} unifiedEnabled
+     * @param {boolean} mirroredEnabled
      * @private
      */
     enableDisplaySettings_: function(
-        enabled, showUnifiedDesktop, multiDisplayLayout) {
+        uiEnabled, unifiedEnabled, mirroredEnabled) {
       if (cr.isChromeOS) {
-        $('display-options').disabled = !enabled;
+        $('display-options').disabled = !uiEnabled;
         DisplayOptions.getInstance().setEnabled(
-            enabled, showUnifiedDesktop, multiDisplayLayout);
+            uiEnabled, unifiedEnabled, mirroredEnabled);
       }
     },
 
     /**
      * Enables factory reset section.
      * @private
      */
     enableFactoryResetSection_: function() {
       $('factory-reset-section').hidden = false;
     },
@@ skipping 573 matching lines @@
       if (section)
         section.hidden = true;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });