Remove support for the keygen tag

components/content_settings/core/common/content_settings.cc

 // Copyright (c) 2011 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.
 
 #include "components/content_settings/core/common/content_settings.h"
 
 #include "base/containers/hash_tables.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/stl_util.h"
@@ skipping 34 matching lines @@
     CONTENT_SETTINGS_TYPE_SSL_CERT_DECISIONS,
     CONTENT_SETTINGS_TYPE_DEFAULT,  // METRO_SWITCH_TO_DESKTOP (removed).
 #if defined(OS_ANDROID) || defined(OS_CHROMEOS)
     CONTENT_SETTINGS_TYPE_PROTECTED_MEDIA_IDENTIFIER,
 #else
     CONTENT_SETTINGS_TYPE_DEFAULT,  // PROTECTED_MEDIA_IDENTIFIER (mobile only).
 #endif
     CONTENT_SETTINGS_TYPE_APP_BANNER,
     CONTENT_SETTINGS_TYPE_SITE_ENGAGEMENT,
     CONTENT_SETTINGS_TYPE_DURABLE_STORAGE,
-    CONTENT_SETTINGS_TYPE_KEYGEN,
+    CONTENT_SETTINGS_TYPE_DEFAULT,  // KEYGEN (removed)
     CONTENT_SETTINGS_TYPE_BLUETOOTH_GUARD,
     CONTENT_SETTINGS_TYPE_BACKGROUND_SYNC,
     CONTENT_SETTINGS_TYPE_AUTOPLAY,
     CONTENT_SETTINGS_TYPE_PROMPT_NO_DECISION_COUNT,
     CONTENT_SETTINGS_TYPE_IMPORTANT_SITE_INFO,
 };
 
 int ContentSettingTypeToHistogramValue(ContentSettingsType content_setting,
                                        size_t* num_values) {
   // Translate the list above into a map for fast lookup.
@@ skipping 26 matching lines @@
 ContentSettingPatternSource::ContentSettingPatternSource()
     : setting(CONTENT_SETTING_DEFAULT), incognito(false) {
 }
 
 ContentSettingPatternSource::ContentSettingPatternSource(
     const ContentSettingPatternSource& other) = default;
 
 RendererContentSettingRules::RendererContentSettingRules() {}
 
 RendererContentSettingRules::~RendererContentSettingRules() {}