Remove support for the keygen tag

chrome/browser/profiles/profile_io_data.h

 // Copyright (c) 2012 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 CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 422 matching lines @@
 
  private:
   class ResourceContext : public content::ResourceContext {
    public:
     explicit ResourceContext(ProfileIOData* io_data);
     ~ResourceContext() override;
 
     // ResourceContext implementation:
     net::HostResolver* GetHostResolver() override;
     net::URLRequestContext* GetRequestContext() override;
-    void CreateKeygenHandler(
-        uint32_t key_size_in_bits,
-        const std::string& challenge_string,
-        const GURL& url,
-        const base::Callback<void(std::unique_ptr<net::KeygenHandler>)>&
-            callback) override;
     std::string GetMediaDeviceIDSalt() override;
 
    private:
     friend class ProfileIOData;
 
     ProfileIOData* const io_data_;
 
     net::HostResolver* host_resolver_;
     net::URLRequestContext* request_context_;
   };
@@ skipping 174 matching lines @@
   mutable std::unique_ptr<certificate_transparency::TreeStateTracker>
       ct_tree_tracker_;
   mutable base::Closure ct_tree_tracker_unregistration_;
 
   const Profile::ProfileType profile_type_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileIOData);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IO_DATA_H_