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The strings were removed from the web UI in a previous changelist
that needed to be merged to M84 and could not touch strings file.
This is the cleanup.

Bug: 1097371
Test: Manually
Change-Id: I7d515b1441b143215f351e4fa4aed294d7ab8efb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261896Reviewed-by: Yilkal Abe <yilkal@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781976}