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Removed and obsoleted NativeSmbFileShare.ReadDirectoryCount and
NativeSmbFileShare.ReadDirectoryDuration, which are no longer used with
the new smbfs implementation that is now enabled by default.

Extended expiry date for NativeSmbFileShare.RemountResult UMA to M94.

Bug: 1088968
Change-Id: I5272135376d22a3b1312de8e5e50f00c6e6b5181
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418754
Commit-Queue: Josh Simmons <simmonsjosh@google.com>
Reviewed-by: Anand K Mistry <amistry@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811559}