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This reverts commit 474b44df.

Reason for revert: Whoops. Reverting due to the prod freeze.

Original change's description:
> Reland "PRESUBMIT.py: Replace checkteamtags with DIR_METADATA checks."
> 
> This is a reland of e6d6e338
> 
> CheckDirMetadataFormat returns a list of input_api.Command objects,
> which are not derived from output_api.PresubmitResult.
> 
> Fixed by running it using input_api.RunTests.
> 
> Original change's description:
> > PRESUBMIT.py: Replace checkteamtags with DIR_METADATA checks.
> >
> > checkteamtags is no longer necessary.
> > - Add a check to validate DIR_METADATA files.
> >   This obviates the need fo checkteamtags, as `dirmd` validates metadata in
> >   OWNERS files, and we no longer need to enforce a unique team email for all
> >   (component, OS) pair.
> > - Add a check to enforce that OWNERS files contain no metadata if a
> >   DIR_METADATA file is present in the same directory.
> >
> > Bug: 1102997
> > Change-Id: I661f7a1958824e7d20642d65534c2502d1a050e2
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317838
> > Reviewed-by: Nodir Turakulov <nodir@chromium.org>
> > Reviewed-by: Dirk Pranke <dpranke@google.com>
> > Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#791884}
> 
> Bug: 1102997
> Change-Id: Iff7d2569ee4e9a5a66773dba47e2de8e3c8f9b82
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321550
> Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
> Commit-Queue: Dirk Pranke <dpranke@google.com>
> Reviewed-by: Dirk Pranke <dpranke@google.com>
> Reviewed-by: Nodir Turakulov <nodir@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#792486}

TBR=dpranke@google.com,nodir@chromium.org,ehmaldonado@chromium.org

Change-Id: I6641555670408ef276296b927a9b8f925e5335a3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1102997
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324556Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#792487}