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Previously base::SysInfo was using uname(), but uname() depends on
fuchsia.device.NameProvider API which may not be accessible in all
processes. This change updates SysInfo to use zx_system_get_version()
to get OS version.

Bug: 986952
Change-Id: Ie3324180040933a509124147efd743de1f112416
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715631
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680176}