I'm seeing this NOTREACHED() hit frequently, which crashes the browser in dcheck_always_on=true builds. I'm testing on eve.

[28454:28454:0731/165236.710537:FATAL:storage_monitor_chromeos.cc(183)] Check failed: false. DiskMountManager::DiskEvent::DISK_CHANGED should not o
ccur for disks on boot device

It seems to repro reliably during suspend (which can be forced by running powerd_dbus_suspend on the command line).