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The UX plan for UI language is to use a single shared locale for OS and
browser. See bug.

Pass the locale on the command line because Lacros needs it very early
in startup, before zygote fork.

This CL doesn't include the changes to browser WebUI settings. We'll
need to add a link-out to OS settings, similar to how Chrome OS
browser settings work today.

Bug: 1139618
Change-Id: I0202ed54d4c4a4956ecb31f04ecde670aea5595f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600316
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838983}