Chrome Version: 67.0.3396.99
OS: MacOS 10.13.5

What steps will reproduce the problem?
(1) Plug in a MacOS laptop into a docking station with an external monitor 
(2) Resize a Chrome browser window to take advantage of the space on the monitor 
(3) Unplug your laptop from the external monitor

What is the expected result?
The Chrome window is still usable normally.

What happens instead?

A strange horizontal gap gets inserted between the Chrome application window and the start of the tab strip. In extreme cases, this significantly cuts off the content area.

The tab strip positioning can be restored by making Chrome fullscreen and exiting fullscreen mode again.