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After https://chromium-review.googlesource.com/c/chromium/src/+/1343054,
HttpStreamFactory::Job::DoInitConnectionComplete will never proceed
on a certificate error, so there is no need to extract ALPN bits.

Inline HandleCertificateError to make this more obvious (otherwise it
looks like HandleCertificateError may sometimes return OK).

Bug: none
Change-Id: I57e9554bd4062a467e4f65306f41f8bbe13c8457
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1595979
Auto-Submit: David Benjamin <davidben@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: David Benjamin <davidben@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657296}