Chrome Version: 66.0.3359.17
OS: Pixel 2 with Android 8.1.0

What steps will reproduce the problem?
(1) Got to https://www.google.com
(2)Trigger the Exit VR dialog.
    Can be triggered by clicking the Security icon on the Omnibox for a URL, the pad lock icon.

What is the expected result?
The dialog should clearly convey to the user that Exit VR leaves and that the other button returns to VR.  Suggest using Cancel instead.

What happens instead?
The Exit VR dialog appears but is confusing with the OK button.