Uncomment prevent_unsafe_narrowing and change from opt-out to opt-in.

This config will take extreme effort to apply, so it makes sense to
start by opting in individual targets.

Bug: 1292951
Change-Id: Ida311bdc17fde8b8adf2c6a231a676d253cf5d8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3669207
Reviewed-by: danakj <danakj@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Owners-Override: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1007928}
NOKEYCHECK=True
GitOrigin-RevId: cc7469c57a25759c39251ca260018be893f686af
1 file changed