Thanks for filing the issue!

Checked the issue on reported chrome version 67.0.3367.0 using Windows 10 with the below mentioned steps.
1. Launched Chrome
2. Navigated to Chrome://flags
3. Enabled Native notifications
4. Clicked on relaunch.

@Reporter: After clicking the relaunch, we didn't see that chrome launched again, Could you please confirm whether that's the issue. And could you please clarify us on your statement "Chrome is launched without a window, only some processes in the background which will eventually exit" in comment#0. Any further inputs from your end may help us.

Yes, that's the issue. After I launch Chrome, I cannot see a window, but can see some processes running for some time from task manager, but they eventually exit.
Still happens in the latest canary 67.0.3368.0.

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

I see the team is working on a fix, https://chromium-review.googlesource.com/c/chromium/src/+/959017 and links to an internal issue, feel free to close this one.

joelismcn@ Thanks for the feedback.

Marking this issue as WontFix and closing this issue as per comment #5 as the reporter has confirmed the same.

Please feel free to raise a new bug if any issues are observed on the latest Chrome builds.

Thanks..