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This CL is a refactor with no intended behavior change.

The implementation of LacrosChromeServiceImpl depends on many version
checks against AshChromeServiceVersion. New code can easily set the
wrong version due to a rebase. Using gneerated MinVersion enums
sidesteps this failure case.

Change-Id: I350dc69f430e7dab81eceaeb118ecdd5687be7dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547789
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828958}