Re-enable support for sending HTTPS URLs via QUIC proxies, but only when
the finch param enable_quic_proxies_for_https_urls is set.

This effectively reverts
  https://chromium-review.googlesource.com/c/chromium/src/+/1375112
and then fixes the underlying bug.

Bug: 914497,335275
Change-Id: Ief24db4226c9d063219ab7df20cf72f23973be23
Reviewed-on: https://chromium-review.googlesource.com/c/1377709
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616958}
8 files changed