Chrome Version: 69.something
OS: Chrome

What steps will reproduce the problem?
1. Turn on chromebook
2. Close lid, wait a minute for the system to suspend
3. Open lid

What is the expected result?
Nothing unusual in the logs.

What happens instead?
[3246:3246:0712/143008.655304:ERROR:object_proxy.cc(616)] Failed to call method: org.chromium.CrosDisks.Unmount: object_path= /org/chromium/CrosDisks: org.chromium.CrosDisks.Error: Failed to unmount '/mnt/stateful_partition'
[3246:3246:0712/143008.655357:ERROR:object_proxy.cc(616)] Failed to call method: org.chromium.CrosDisks.Unmount: object_path= /org/chromium/CrosDisks: org.chromium.CrosDisks.Error: Failed to unmount '/usr/share/oem'
[3246:3246:0712/143017.415825:ERROR:device_event_log_impl.cc(159)] [14:30:17.415] Network: network_state_handler.cc:1708 DefaultNetworkPropertyUpdated: /service/9 (GoogleGuest) Error = "out-of-range"
[3246:3246:0712/143017.431810:ERROR:device_event_log_impl.cc(159)] [14:30:17.431] Network: network_state_handler.cc:1624 Default network in unexpected state: GoogleGuest (/service/9)State: failure
[3246:3246:0712/143017.437662:ERROR:device_event_log_impl.cc(159)] [14:30:17.437] Network: network_state_handler.cc:1708 NetworkPropertyUpdated: /service/9 (GoogleGuest) Error = "Unknown"
[3246:3246:0712/143017.479530:ERROR:device_event_log_impl.cc(159)] [14:30:17.479] Network: network_state_handler.cc:1708 NetworkPropertyUpdated: /service/1 (Ethernet) Error = "Unknown"
[3246:3246:0712/143017.626146:ERROR:storage_monitor_chromeos.cc(187)] NOTREACHED() hit.

This is happening on a Chell. Basically, Chrome thinks the internal storage is an SD card (because cros-disks reports it as such, because it's an MMC (actually eMMC) device) and so it gets unmounted on suspend.