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This CL updates label icons to no longer perform the text "slide"
animation when the OS accessibility setting "prefers reduced motion"
is enabled.

Before:
https://bugs.chromium.org/p/chromium/issues/attachment?aid=417373&signed_aid=t0VJYHPUtkw0z1lDKkbiVA==&inline=1
After:
https://bugs.chromium.org/p/chromium/issues/attachment?aid=417374&signed_aid=5yX5WthdugQRYA75A6Ua8A==&inline=1

Change-Id: I79ede8bfec7c0c13b9678e2374ba16ec1aefee7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1871504
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708441}