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This is a reland of 6d67f881

Original change's description:
> Start setting StartVmRequest.vm
> 
> This is currently ignored by concierge when starting termina, but
> since termina can now be installed in multiple different locations we
> need concierge to start taking the value that chrome sets.
> 
> Bug: 953544
> Change-Id: I51b1ea50a5ae056d6af6baa0743a3cb0c8f8f5e5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2329126
> Commit-Queue: Fergus Dall <sidereal@google.com>
> Reviewed-by: Nicholas Verne <nverne@chromium.org>
> Reviewed-by: David Munro <davidmunro@google.com>
> Cr-Commit-Position: refs/heads/master@{#795346}

Bug: 953544
Change-Id: Ib741759a5b61dc810d66c9d182131766247a5a30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341224
Commit-Queue: Fergus Dall <sidereal@google.com>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: David Munro <davidmunro@google.com>
Cr-Commit-Position: refs/heads/master@{#796450}