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This way, it can be used in QUIC code that does not depend on
QuicStreamFactory.

R=rch@chromium.org

Bug: 1011392
Change-Id: I5d585067012ec7e5c28779080326ebdd1318203a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1973171Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726001}