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This reverts commit c4cbb461.

Reason for revert: this CSS is used after all. See bug and
AppLauncherLoginHandler::UpdateLogin()

Bug: 1141291

Original change's description:
> Remove defunct NTP css.
>
> action-link no longer exists on the NTP.
>
> Bug: none
> Change-Id: I4df61932f6b1885bd98a56f4963aead4dafe352c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480889
> Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
> Commit-Queue: Evan Stade <estade@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#818595}

TBR=estade@chromium.org,gayane@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: none
Change-Id: I4c0ead807a2064f5d51ef7aa631ac3602433697a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2491972Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820107}