[depot_tools] Migrate metadata to DIR_METADATA.
Change-Id: I7e07de8746a269a31744f44296921cc9c6566a73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2597738
Reviewed-by: Andy Perelson <ajp@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
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