Fix bogus master-manager got_revision_mapping
Fix bogus master-manager got_revision_mapping

Bug: 713356
TBR=tandrii@chromium.org

Change-Id: I4af86f67216e1fc07da099e42608ad4a93c6b354
Reviewed-on: https://chromium-review.googlesource.com/484401
Reviewed-by: Michael Achenbach <76cc7f10de6bc994d83c4cb09072e4590b82b709@chromium.org>
Commit-Queue: Michael Achenbach <76cc7f10de6bc994d83c4cb09072e4590b82b709@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools