Remove support for the keygen tag

content/public/browser/resource_context.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 CONTENT_PUBLIC_BROWSER_RESOURCE_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_RESOURCE_CONTEXT_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/supports_user_data.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 
-class GURL;
-
 namespace net {
 class HostResolver;
-class KeygenHandler;
 class URLRequestContext;
 }
 
 namespace content {
 
 // ResourceContext contains the relevant context information required for
 // resource loading. It lives on the IO thread, although it is constructed on
 // the UI thread. It must be destructed on the IO thread.
 class CONTENT_EXPORT ResourceContext : public base::SupportsUserData {
  public:
   ResourceContext();
   ~ResourceContext() override;
   virtual net::HostResolver* GetHostResolver() = 0;
 
   // DEPRECATED: This is no longer a valid given isolated apps/sites and
   // storage partitioning. This getter returns the default context associated
   // with a BrowsingContext.
   virtual net::URLRequestContext* GetRequestContext() = 0;
 
-  // Create a platform KeygenHandler and pass it to |callback|. The |callback|
-  // may be run synchronously.
-  virtual 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);
-
   // Returns a random salt string that is used for creating media device IDs.
   // Returns a random string by default.
   virtual std::string GetMediaDeviceIDSalt();
 
   // Utility function useful for embedders. Only needs to be called if
   // 1) The embedder needs to use a new salt, and
   // 2) The embedder saves its salt across restarts.
   static std::string CreateRandomMediaDeviceIDSalt();
 
  private:
   const std::string media_device_id_salt_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RESOURCE_CONTEXT_H_