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This CL cleans up the use MainParams by removing duplicate
functionality provided by version_info. As noted in the
bug, this CL also will update the user agent string to be
consistent with the Chrome user agent.


Bug: 1018236
Change-Id: Iee35d1312861537013eeaeb047b75cd05d877851
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1909282
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714936}