Revert "Print Preview: Migrate key event, link container and layout tests to TS"

This reverts commit 1c703f052b7eb2b6b432e240e51223bbe2433224.

Reason for revert: Made KeyEventTest.CmdPeriodClosesDialogOnMacOnly flaky 

Bug: 1276217

Original change's description:
> Print Preview: Migrate key event, link container and layout tests to TS
>
> Also updating various Print Preview key handling code to use event.key
> rather than event.code.
>
> Bug: 1245834
> Change-Id: Ib1fadcb17d94bdcae710421ed7c991df6d25fe61
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3310197
> Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
> Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#947690}

Bug: 1245834
Change-Id: I4370d072201a09b19545e73689e9bf8fdbeaa169
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3312930
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Owners-Override: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#947819}