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This reverts commit 44bf467c.

Reason for revert: Asset issue.

Original change's description:
> Update lock screen submit button icon
> 
> Changed the asset size from 24 to 20. Others remain the same.
> 
> Bug: NONE
> Change-Id: I1da0b131ca29416089e657ac706a8100812ea644
> Reviewed-on: https://chromium-review.googlesource.com/688028
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#504894}

TBR=oshima@chromium.org,wzang@chromium.org

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

Bug: NONE
Change-Id: I63c08344f68e2403ae7e4e6e55dfc1a3738e2bfe
Reviewed-on: https://chromium-review.googlesource.com/691556Reviewed-by: Wenzhao (Colin) Zang <wzang@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505315}