message: buffered_frame_decryptor: dont assume GFD is present
  Cr-Commit-Position: refs/heads/master@{#34671}
diff: @@ -62,11 +62,6 @@ BufferedFrameDecryptor::FrameDecision BufferedFrameDecryptor::DecryptFrame(
  "stream. Stashing frame.";
  return FrameDecision::kStash;
  }
  - // When using encryption we expect the frame to have the generic descriptor.
  - if (frame->GetRtpVideoHeader().generic == absl::nullopt) {
  - RTC_LOG(LS_ERROR) << "No generic frame descriptor found dropping frame.";
  - return FrameDecision::kDrop;
  - }
  // Retrieve the maximum possible size of the decrypted payload.
  const size_t max_plaintext_byte_size =
  frame_decryptor_->GetMaxPlaintextByteSize(cricket::MEDIA_TYPE_VIDEO,
  