src: remove nonexistent method from header file

PR-URL: #17748
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: addaleax

src/tls_wrap.h

@@ -120,7 +120,6 @@ class TLSWrap : public AsyncWrap,
                          const uv_buf_t* buf,
                          uv_handle_type pending,
                          void* ctx);
-  static void OnAfterWriteSelf(WriteWrap* w, void* ctx);
   static void OnAllocSelf(size_t size, uv_buf_t* buf, void* ctx);
   static void OnReadSelf(ssize_t nread,
                          const uv_buf_t* buf,