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This reverts commit 0f4c96b1.

Reason for revert: The CHECK added in crostini_export_import has been failing with a high rate of flakes. On unrelated infra change. crbug.com/993521

Original change's description:
> crostini: log .tini export statistics
> 
> BUG=992293
> 
> Change-Id: Id54f0b0f26e06b1ce5c2c7c4e725889867e88334
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1750516
> Commit-Queue: Julian Watson <juwa@google.com>
> Auto-Submit: Julian Watson <juwa@google.com>
> Reviewed-by: Joel Hockey <joelhockey@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#686355}

TBR=joelhockey@chromium.org,juwa@google.com

Change-Id: Id2ff483d833df1770abdd40a1440a544f4514e9a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 992293
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752929Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686564}