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This is a follow up to https://crrev.com/c/2274667

This attribute was recently introduced so that developers wouldn't
get presubmit errors for accessibility labels that are not shown in the
UI. However, screen readers do actually display most accessibility
labels, so having screenshots for these strings are still useful. Still,
there is a small subset of accessibility labels that are never
displayed. This CL renames the existing attribute to make the intention
of the carveout clear.

Bug: 1094077
Change-Id: I4c171d29fea0aac611cb07759422bd5c25688017
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285076
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786025}