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This reverts commit b988cfa5.

Reason for revert: per https://crbug.com/1102947#c4, this was already fixed a day earlier, in https://crbug.com/1100152

Original change's description:
> Sheriff: Disable Flaky FilesAppBrowserTests in TabletMode.
> 
> Flaky tests include: (FileDisplay|QuickView)/FilesAppBrowserTest.Test/(fileDisplayDrive|openQuickView|fileDisplayDownloads)_TabletMode.
> 
> Flake occurrences can be viewed at https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyOgsSBUZsYWtlIi9jaHJvbWl1bUBicm93c2VyX3Rlc3RzQEZpbGVzQXBwQnJvd3NlclRlc3QuVGVzdAw
> 
> TBR: lucmult@chromium.org
> Bug: 1102947
> Change-Id: Id39ff39a94e955f0a513b7e5ddceef264846beae
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285298
> Reviewed-by: Darwin Huang <huangdarwin@chromium.org>
> Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#786050}

TBR=lucmult@chromium.org,huangdarwin@chromium.org

Change-Id: I5cb75418c2be74a1ad4dda713376ece9e66de164
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1102947
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2286190Reviewed-by: Darwin Huang <huangdarwin@chromium.org>
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786085}