Rename ContentSettingValues enum to ContentSetting

Match C++ and Java enum name to avoid confusion.

Change-Id: Ia535b4afc44061b5a1d206bc18720a2c9a0f5427
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6897732
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Auto-Submit: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Victor Vianna <victorvianna@google.com>
Reviewed-by: Fiona Macintosh <fmacintosh@google.com>
Reviewed-by: Florian Jacky <fjacky@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1509256}