Views Cleanup: Removed View::visible() and View::enabled() and fixed up some references.

Follow-up to https://crrev.com/c/1610082

TBR=pkasting@chromium.org
TBR=reveman@chromium.org
TBR=halliwell@chromium.org

Change-Id: I9bf6e68a776143e4aa56943dc8768a778c4ab078
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611863
Commit-Queue: Allen Bauer <kylixrd@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660076}