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This CL offers both singular and plural options for the close button
string in guest mode to allow translation as mentioned in b/168224245.

Bug: none.
Change-Id: I6b3c0d0e4bbd77e2e37035e62d7068358278ebe8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410031Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Commit-Queue: Mariam Ali <alimariam@google.com>
Cr-Commit-Position: refs/heads/master@{#806999}