Remove support for the keygen tag

third_party/WebKit/public/web/WebContentSettingsClient.h

 // Copyright 2015 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.
 
 #ifndef WebContentSettingsClient_h
 #define WebContentSettingsClient_h
 
 #include "public/platform/WebContentSettingCallbacks.h"
 
 namespace blink {
@@ skipping 100 matching lines @@
   virtual void passiveInsecureContentFound(const WebURL&) {}
 
   // Notifies the client that the frame would have instantiated a plugin if
   // plugins were enabled.
   virtual void didNotAllowPlugins() {}
 
   // Notifies the client that the frame would have executed script if script
   // were enabled.
   virtual void didNotAllowScript() {}
 
-  // Notifies the client that the frame instantiated a keygen element.
-  virtual void didUseKeygen() {}
-
   virtual ~WebContentSettingsClient() {}
 };
 
 }  // namespace blink
 
 #endif  // WebContentSettingsClient_h