Remove support for the keygen tag

content/browser/resource_context_impl.cc

Index: content/browser/resource_context_impl.cc
diff --git a/content/browser/resource_context_impl.cc b/content/browser/resource_context_impl.cc
index 22c12ee987d1f67c7a39b0dc326d7ad7d0a09812..62b4396a5bd0f48a0c17538db86a46beb5f7ec7b 100644
--- a/content/browser/resource_context_impl.cc
+++ b/content/browser/resource_context_impl.cc
@@ -18,7 +18,6 @@
 #include "content/browser/webui/url_data_manager_backend.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
-#include "net/base/keygen_handler.h"
 
 using base::UserDataAdapter;
 
@@ -42,15 +41,6 @@ std::string ResourceContext::GetMediaDeviceIDSalt() {
   return media_device_id_salt_;
 }
 
-void ResourceContext::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) {
-  callback.Run(base::MakeUnique<net::KeygenHandler>(key_size_in_bits,
-                                                    challenge_string, url));
-}
-
 // static
 std::string ResourceContext::CreateRandomMediaDeviceIDSalt() {
   std::string salt;