Remove support for the keygen tag

chrome/browser/ui/webui/site_settings_helper.cc

 // 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.
 
 #include "chrome/browser/ui/webui/site_settings_helper.h"
 
 #include <functional>
 #include <string>
 
 #include "base/memory/ptr_util.h"
@@ skipping 54 matching lines @@
     {CONTENT_SETTINGS_TYPE_PROTOCOL_HANDLERS, "register-protocol-handler"},
     {CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC, "media-stream-mic"},
     {CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA, "media-stream-camera"},
     {CONTENT_SETTINGS_TYPE_PPAPI_BROKER, "ppapi-broker"},
     {CONTENT_SETTINGS_TYPE_AUTOMATIC_DOWNLOADS, "multiple-automatic-downloads"},
     {CONTENT_SETTINGS_TYPE_MIDI_SYSEX, "midi-sysex"},
     {CONTENT_SETTINGS_TYPE_SSL_CERT_DECISIONS, "ssl-cert-decisions"},
 #if defined(OS_CHROMEOS)
     {CONTENT_SETTINGS_TYPE_PROTECTED_MEDIA_IDENTIFIER, "protectedContent"},
 #endif
-    {CONTENT_SETTINGS_TYPE_KEYGEN, "keygen"},
     {CONTENT_SETTINGS_TYPE_BACKGROUND_SYNC, "background-sync"},
 };
 
 }  // namespace
 
 bool HasRegisteredGroupName(ContentSettingsType type) {
   for (size_t i = 0; i < arraysize(kContentSettingsTypeGroupNames); ++i) {
     if (type == kContentSettingsTypeGroupNames[i].type)
       return true;
   }
@@ skipping 368 matching lines @@
     }
   }
 
   for (auto& one_provider_exceptions : all_provider_exceptions) {
     for (auto& exception : one_provider_exceptions)
       exceptions->Append(std::move(exception));
   }
 }
 
 }  // namespace site_settings