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Refactors three Switch Access classes for clarity, consistency, and
readability.

Bug: None
Change-Id: Ib81a279cef24348f997f870f208413245a8c2357
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2064790Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Cr-Commit-Position: refs/heads/master@{#744045}