Http2Stream::SubmitTrailers::SubmitTrailers(
    Http2Session* session,
    Http2Stream* stream,
    uint32_t* flags)
  : session_(session), stream_(stream), flags_(flags) { }
Http2Stream::SubmitTrailers::SubmitTrailers(
    Http2Session* session,
    Http2Stream* stream,
    uint32_t* flags)
  : session_(session), stream_(stream), flags_(flags) { }