flags: indef use-sync-sandbox

Per email discussion, this flag is required in concert with
wallet-service-use-sandbox for some kinds of Wallet testing on Android.

Bug: None
Change-Id: Ia16feccc938da4a5ed82da5c929883156cbbf808
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1573649
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Auto-Submit: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652162}
2 files changed