tree 13e1d1e76f109862da3fef9dc52860432e272cbd
parent 7be3caccf89cbc7bda2cc92037c6758739c2f835
author renjietang <renjietang@google.com> 1564787871 -0700
committer Copybara-Service <copybara-worker@google.com> 1565021307 -0700

Remove incorrect uses of GetHeadersStreamId().

Many places call GetHeadersStreamId() only to use the first stream id. So I
reaplced them with GetFirstBirectionalStreamId().

gfe-relnote: v99 and test change only, not protected.
PiperOrigin-RevId: 261412202
Change-Id: I54f3b5b5a100d8b8d31a0de5ecb324b474c6a430