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The function is anonymous::SelectedLinuxBackendToString() and it is
called from KeyStorageLinux::CreateService from under a bunch of
#ifdef's

Change-Id: Ia087cf602b0fc09c76e2f3c77322a66680ed6d30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900114
Commit-Queue: Peter Kvitek <kvitekp@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712719}