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This reverts commit 9d53cbf3.

Reason for revert: https://crbug.com/1122225 (build errors for downstream checkouts)

Original change's description:
> Remove unused androidx-legacy libraries
> 
> As far as I can tell these were never used...
> 
> Bug: 1121713
> Change-Id: Ie81d7bfa72e40b48a775442684aae025a55259f4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376125
> Commit-Queue: Andrew Grieve <agrieve@chromium.org>
> Commit-Queue: benjamin joyce <bjoyce@chromium.org>
> Auto-Submit: Andrew Grieve <agrieve@chromium.org>
> Reviewed-by: benjamin joyce <bjoyce@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#801973}

TBR=agrieve@chromium.org,bjoyce@chromium.org

Change-Id: I745e025f674b51f012fa138d5abd760444ded1c2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1121713
Fixed: 1122225
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378736Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802001}