Remove support for the keygen tag

third_party/WebKit/Source/core/loader/FrameLoaderClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 245 matching lines @@
 
   // This callback notifies the client that the frame was about to run
   // JavaScript but did not because allowScript returned false. We have a
   // separate callback here because there are a number of places that need to
   // know if JavaScript is enabled but are not necessarily preparing to execute
   // script.
   virtual void didNotAllowScript() {}
   // This callback is similar, but for plugins.
   virtual void didNotAllowPlugins() {}
 
-  // This callback notifies the client that the frame created a Keygen element.
-  virtual void didUseKeygen() {}
-
   virtual WebCookieJar* cookieJar() const = 0;
 
   virtual void didChangeName(const String& name, const String& uniqueName) {}
 
   virtual void didEnforceInsecureRequestPolicy(WebInsecureRequestPolicy) {}
 
   virtual void didUpdateToUniqueOrigin() {}
 
   virtual void didChangeSandboxFlags(Frame* childFrame, SandboxFlags) {}
 
@@ skipping 63 matching lines @@
   // Overwrites the given URL to use an HTML5 embed if possible. An empty URL is
   // returned if the URL is not overriden.
   virtual KURL overrideFlashEmbedWithHTML(const KURL&) { return KURL(); }
 
   virtual BlameContext* frameBlameContext() { return nullptr; }
 };
 
 }  // namespace blink
 
 #endif  // FrameLoaderClient_h