Remove support for the keygen tag

content/public/browser/resource_context.h

Index: content/public/browser/resource_context.h
diff --git a/content/public/browser/resource_context.h b/content/public/browser/resource_context.h
index d2eeb30e8f7037013d2703fd57f21dd458322f86..602f935372b3ec7af81dcd338c0b749f1f224258 100644
--- a/content/public/browser/resource_context.h
+++ b/content/public/browser/resource_context.h
@@ -15,11 +15,8 @@
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 
-class GURL;
-
 namespace net {
 class HostResolver;
-class KeygenHandler;
 class URLRequestContext;
 }
 
@@ -39,15 +36,6 @@ class CONTENT_EXPORT ResourceContext : public base::SupportsUserData {
   // 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();