Remove legacy Conv1D -> conv1D downcasing.
Remove legacy Conv1D -> conv1D downcasing.

PiperOrigin-RevId: 389223710

google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research