loadWebsiteTest and loadWebsitesInMultipleTabsTest were failing because
AwesomeBarFeature was asking for a negative number of history suggestions.

This allows clients to limit the number of suggested history items to even
below that of the default 5.

This allows clients to limit the number of suggested history items to even
below that of the default 20.

 to be block audio only by default

 `Drawable.setTint` did not correctly apply the tint received from Fenix. Switching to `imageView.setTintResource` fixes the issue.

* Nimbus UI to Opt-in and opt-out from an experiment

* Address reviewer comments

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>