Revert "Add screenshots for Data Saver rebrand to Lite mode"

This reverts commit 3317dddc5108187c00da3eb8637e44c3d455d055.

Reason for revert: These string changes should be behind a Finch flag

Original change's description:
> Add screenshots for Data Saver rebrand to Lite mode
> 
> Bug: 909915
> Change-Id: I6e17ea7904a818a04061fcd07ef45368bf5b591b
> Reviewed-on: https://chromium-review.googlesource.com/c/1359855
> Commit-Queue: Megan Jablonski <megjablon@chromium.org>
> Reviewed-by: Tarun Bansal <tbansal@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#613732}

TBR=tbansal@chromium.org,megjablon@chromium.org

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

Bug: 909915
Change-Id: I78b13f04a02971f0b1f72c4fe5d49e0762cbd6e6
Reviewed-on: https://chromium-review.googlesource.com/c/1427921
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624975}
28 files changed