Remove support for the keygen tag

chrome/test/data/webui/settings/test_site_settings_prefs_browser_proxy.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.
 
 /**
  * An example empty pref.
  * @type {SiteSettingsPref}
  */
 var prefsEmpty = {
   defaults: {
     auto_downloads: '',
     background_sync: '',
     camera: '',
     cookies: '',
     geolocation: '',
     javascript: '',
-    keygen: '',
     mic: '',
     notifications: '',
     plugins: '',
     popups: '',
     unsandboxed_plugins: '',
   },
   exceptions: {
     auto_downloads: [],
     background_sync: [],
     camera: [],
     cookies: [],
     geolocation: [],
     javascript: [],
-    keygen: [],
     mic: [],
     notifications: [],
     plugins: [],
     popups: [],
     unsandboxed_plugins: [],
   },
 };
 
 /**
  * A test version of SiteSettingsPrefsBrowserProxy. Provides helper methods
@@ skipping 96 matching lines @@
     } else if (contentType == settings.ContentSettingsTypes.CAMERA) {
       pref = this.prefs_.defaults.camera;
     } else if (contentType == settings.ContentSettingsTypes.COOKIES) {
       pref = this.prefs_.defaults.cookies;
     } else if (contentType == settings.ContentSettingsTypes.GEOLOCATION) {
       pref = this.prefs_.defaults.geolocation;
     } else if (contentType == settings.ContentSettingsTypes.IMAGES) {
       pref = this.prefs_.defaults.images;
     } else if (contentType == settings.ContentSettingsTypes.JAVASCRIPT) {
       pref = this.prefs_.defaults.javascript;
-    } else if (contentType == settings.ContentSettingsTypes.KEYGEN) {
-      pref = this.prefs_.defaults.keygen;
     } else if (contentType == settings.ContentSettingsTypes.MIC) {
       pref = this.prefs_.defaults.mic;
     } else if (contentType == settings.ContentSettingsTypes.NOTIFICATIONS) {
       pref = this.prefs_.defaults.notifications;
     } else if (contentType == settings.ContentSettingsTypes.PDF_DOCUMENTS) {
       pref = this.prefs_.defaults.pdf_documents;
     } else if (contentType == settings.ContentSettingsTypes.POPUPS) {
       pref = this.prefs_.defaults.popups;
     } else if (contentType == settings.ContentSettingsTypes.PLUGINS) {
       pref = this.prefs_.defaults.plugins;
@@ skipping 20 matching lines @@
     else if (contentType == settings.ContentSettingsTypes.CAMERA)
       pref = this.prefs_.exceptions.camera;
     else if (contentType == settings.ContentSettingsTypes.COOKIES)
       pref = this.prefs_.exceptions.cookies;
     else if (contentType == settings.ContentSettingsTypes.GEOLOCATION)
       pref = this.prefs_.exceptions.geolocation;
     else if (contentType == settings.ContentSettingsTypes.IMAGES)
       pref = this.prefs_.exceptions.images;
     else if (contentType == settings.ContentSettingsTypes.JAVASCRIPT)
       pref = this.prefs_.exceptions.javascript;
-    else if (contentType == settings.ContentSettingsTypes.KEYGEN)
-      pref = this.prefs_.exceptions.keygen;
     else if (contentType == settings.ContentSettingsTypes.MIC)
       pref = this.prefs_.exceptions.mic;
     else if (contentType == settings.ContentSettingsTypes.NOTIFICATIONS)
       pref = this.prefs_.exceptions.notifications;
     else if (contentType == settings.ContentSettingsTypes.PDF_DOCUMENTS)
       pref = this.prefs_.exceptions.pdf_documents;
     else if (contentType == settings.ContentSettingsTypes.PLUGINS)
       pref = this.prefs_.exceptions.plugins;
     else if (contentType == settings.ContentSettingsTypes.POPUPS)
       pref = this.prefs_.exceptions.popups;
@@ skipping 54 matching lines @@
   /** @override */
   setProtocolDefault: function() {
     this.methodCalled('setProtocolDefault', arguments);
   },
 
   /** @override */
   removeProtocolHandler: function() {
     this.methodCalled('removeProtocolHandler', arguments);
   }
 };