Remove support for the keygen tag

third_party/WebKit/public/platform/Platform.h

 /*
  * 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:
  *
  *     * 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 268 matching lines @@
   // link coloring.
   virtual unsigned long long visitedLinkHash(const char* canonicalURL,
                                              size_t length) {
     return 0;
   }
 
   // Returns whether the given link hash is in the user's history. The
   // hash must have been generated by calling VisitedLinkHash().
   virtual bool isLinkVisited(unsigned long long linkHash) { return false; }
 
-  // Keygen --------------------------------------------------------------
-
-  // Handle the <keygen> tag for generating client certificates
-  // Returns a base64 encoded signed copy of a public key from a newly
-  // generated key pair and the supplied challenge string. keySizeindex
-  // specifies the strength of the key.
-  virtual WebString signedPublicKeyAndChallengeString(
-      unsigned keySizeIndex,
-      const WebString& challenge,
-      const WebURL& url,
-      const WebURL& topOrigin) {
-    return WebString();
-  }
-
   // Same as above, but always returns actual value, without any caches.
   virtual size_t actualMemoryUsageMB() { return 0; }
 
   // Return the number of of processors of the current machine.
   virtual size_t numberOfProcessors() { return 0; }
 
   static const size_t noDecodedImageByteLimit = static_cast<size_t>(-1);
 
   // Returns the maximum amount of memory a decoded image should be allowed.
   // See comments on ImageDecoder::m_maxDecodedBytes.
@@ skipping 362 matching lines @@
  protected:
   Platform();
   virtual ~Platform() {}
 
   WebThread* m_mainThread;
 };
 
 }  // namespace blink
 
 #endif