UserAgent: Mozilla/5.0 (X11; CrOS x86_64 9901.77.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.97 Safari/537.36
Platform: 9901.77.0	62.0.3202.97 stable-channel Dell Chromebook 11

Steps to reproduce the problem:
1. Disable the Incognito access from the Admin Console.
2. As a user go to chrome://inspect .
2. Inspect the Extension Chrome OS XKB.
3. This opens the developer tools.
4. Go to the Application's Tab and click or right click on 'Read more about the web manifest'.
5. This will somehow trigger an incognito window and the incognito option is visible from settings. 

What is the expected behavior?
This should open on a regular window

What went wrong?
It opens an incognito window which is disabled from the Admin Console as enforced policy 

Did this work before? N/A 

Chrome version: 62.0.3202.97  Channel: stable
OS Version: 9901.77.0
Flash Version: 

Please a find a detailed video for @google.com at https://drive.google.com/open?id=1kwtcJcSJG3b70g_PpuITCHCrowuoDqX8