HttpStreamPool: Support UploadDataStream::AllowHTTP1()

When the method returns false, the HttpStreamFactory layer should
return ERR_H2_OR_QUIC_REQUIRED if the negotiated protocol is unknown
or H1. Plumb the value from StreamRequestInfo::is_http1_allowed to
HttpStreamPool and check whether the negotiated protocol is allowed
or not.

This CL introduces a struct to plumb the value and other information
that is needed to switch to the HttpStreamPool.

This fixes URLLoaderTest.UploadChunkedDataPipeNotAllowHTTP1 when
the HttpStreamPool is used.

Bug: 346835898
Change-Id: Ie8be310d2342381f2c6e48c2a58992d881bc56ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5829018
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Nidhi Jaju <nidhijaju@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1352640}