[Cronet] Note that the UrlRequest owns the response info and error.

Also, note this in the implementation, including implications for
locking.

Bug: 938630
Change-Id: Id8ff8dda2e069905616e6b852d99532a289020d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1582231
Reviewed-by: Misha Efimov <mef@chromium.org>
Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Commit-Queue: Caleb Raitto <caraitto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654316}
2 files changed