Remove support for the keygen tag

third_party/WebKit/public/platform/WebLocalizedString.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 86 matching lines @@
     CalendarToday,
     DateFormatDayInMonthLabel,
     DateFormatMonthLabel,
     DateFormatYearLabel,
     DetailsLabel,
     DownloadButtonLabel,
     FileButtonChooseFileLabel,
     FileButtonChooseMultipleFilesLabel,
     FileButtonNoFileSelectedLabel,
     InputElementAltText,
-    KeygenMenuHighGradeKeySize,
-    KeygenMenuMediumGradeKeySize,
     MissingPluginText,
     MultipleFileUploadText,
     OtherColorLabel,
     OtherDateLabel,
     OtherMonthLabel,
     OtherTimeLabel,
     OtherWeekLabel,
     OverflowMenuCaptions,
     OverflowMenuCast,
     OverflowMenuEnterFullscreen,
@@ skipping 56 matching lines @@
     ValidationValueMissingForRadio,
     ValidationValueMissingForSelect,
     WeekFormatTemplate,
     WeekNumberLabel,
   };
 };
 
 }  // namespace blink
 
 #endif