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This CL adds the basic plumbing necessary for Lacros to avoid calling
unavailable methods on ash due to ash being too old.

This requires modifying browser tests to disable all crosapi
functionality, and to modify production logic to avoid using crosapi
functionality if it's unavailable.

Bug: 1130810
Change-Id: Iedf7faae93372e42c59a61186df49d683d859f50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424544Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Auto-Submit: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810762}