Remove local NTP flags

Remove various flags controlling the local NTP in M76+. They
are enabled by default in M75 and enabled via Finch for M73-M75.

Bug: 583289

Change-Id: Iedc5589ceb2e44060482b3be3cec9d1a74249f1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1553165
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653424}
27 files changed