Disable ability to show passwords when running in Metro.

chrome/browser/resources/options/password_manager.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.define('options', function() {
   /** @const */ var OptionsPage = options.OptionsPage;
   /** @const */ var ArrayDataModel = cr.ui.ArrayDataModel;
 
   /////////////////////////////////////////////////////////////////////////////
   // PasswordManager class:
@@ skipping 166 matching lines @@
      * Updates the data model for the password exceptions list with the values
      * from |entries|.
      * @param {Array} entries The list of password exception data.
      */
     setPasswordExceptionsList_: function(entries) {
       this.passwordExceptionsList_.dataModel = new ArrayDataModel(entries);
       this.updateListVisibility_(this.passwordExceptionsList_);
     },
 
     /**
+     * Removes the show password button. This is called by the backend when
+     * we are running in an environment that does not support showing
+     * passwords, such as Windows Metro
+     */
+    disableShowPassword_: function() {
+      this.savedPasswordsList_.disableShowPassword();
+    },
+
+    /**
      * Reveals the password for a saved password entry. This is called by the
      * backend after it has authenticated the user.
      * @param {number} index The original index of the entry in the model.
      * @param {string} password The saved password.
      */
     showPassword_: function(index, password) {
       var model = this.savedPasswordsList_.dataModel;
       if (this.lastQuery_) {
         // When a filter is active, |index| does not represent the current
         // index in the model, but each entry stores its original index, so
@@ skipping 29 matching lines @@
   };
 
   PasswordManager.requestShowPassword = function(index) {
     chrome.send('requestShowPassword', [index]);
   };
 
   // Forward public APIs to private implementations on the singleton instance.
   [
     'setSavedPasswordsList',
     'setPasswordExceptionsList',
-    'showPassword'
+    'showPassword',
+    'disableShowPassword'
    ].forEach(function(name) {
      PasswordManager[name] = function() {
       var instance = PasswordManager.getInstance();
       return instance[name + '_'].apply(instance, arguments);
     };
   });
 
   // Export
   return {
     PasswordManager: PasswordManager
   };
 
 });