Revert "Rebrand Data Saver to Lite mode"

This reverts commit 6f01ecff8157c0ee41b669876dc6536f2765ce40.

Reason for revert: String changes should be behind a Finch flag

Original change's description:
> Rebrand Data Saver to Lite mode
> 
> Change-Id: I777e068f0391dfd0e45c26fde83c423d3374cb20
> Bug: 909915
> Reviewed-on: https://chromium-review.googlesource.com/c/1354346
> Reviewed-by: Theresa <twellington@chromium.org>
> Reviewed-by: Tarun Bansal <tbansal@chromium.org>
> Commit-Queue: Megan Jablonski <megjablon@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#613368}

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

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

Bug: 909915
Change-Id: Ibc26a00f54b7a63e31fefe6dff037c124616d835
Reviewed-on: https://chromium-review.googlesource.com/c/1427920
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625031}
4 files changed