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Https is quite heavy for periodic connectivity check. Change to http
version to reduce the server load after initial https check passsed.

Bug: b/135769650
Test: Verified the check change to http one after last check succeed.
Change-Id: I73d0c9ffaa6a22d0319d6782ed17ee1152045894
Signed-off-by: Edward Wang <wangedward@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1677263Reviewed-by: Sergey Volk <servolk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672661}