UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3198.0 Safari/537.36

Steps to reproduce the problem:
1. Launch Chrome with --headless. Give it a --user-data-dir to a directory which contains a Default/Preferences file with the following contents:

{"profile":{"content_settings":{"exceptions":{"notifications":{"https://localhost.ssl:9877,*":{"setting":1}}}}}}

3. Navigate to https://localhost.ssl:9877
4. Notification.permission will return "denied"

What is the expected behavior?
Notification.permission should be "granted" given when the content setting preferences are set to allow notifications. If I use the same user directory and launch Chrome directly (i.e. non-headless), and navigate to that same url, clicking to the left of the URL bar shows that Notifications are set to "Always allow on this site" as expected.

What went wrong?
Notification permission was still reported as denied though it had been granted.

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 62.0.3198.0  Channel: dev
OS Version: OS X 10.12.0
Flash Version: