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This reverts commit 9594a943.

Reason for revert: https://crrev.com/c/1217506 is causing crashes in Canary (https://crbug.com/889422). Reverting this CL is necessary in order to be able to revert that CL.

Original change's description:
> [FileSystem] Add support for selecting multiple files or directories.
> 
> Bug: 878581
> Change-Id: I65fc0029da2e3951495a6cd96704085e5c1b942c
> Reviewed-on: https://chromium-review.googlesource.com/1227366
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Daniel Murphy <dmurph@chromium.org>
> Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#594132}

TBR=dcheng@chromium.org,dmurph@chromium.org,mek@chromium.org

Change-Id: I8af7db79f5156bc354ade87b2ac5e31955b41cc3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 878581
Reviewed-on: https://chromium-review.googlesource.com/1246862Reviewed-by: Adithya Srinivasan <adithyas@chromium.org>
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594446}