Chrome Version: Canary 69.0.3446.0 
OS: macOS 10.13.4

What steps will reproduce the problem?
(1) Enable MacViews-Browser & MD-Refresh
(2) Open two tabs, so that you leave the single tab mode 
(3) Try to move the window by dragging it at the bottom part of the Tabstrip

What is the expected result?
The window should be draggable.

What happens instead?
The window isn't draggable at the bottom area.

A screenshot and a screencast is attached.

I noticed this after the following change: https://chromium-review.googlesource.com/c/chromium/src/+/1029173

Thanks
Mehmet
 

Deleted: dead-drag-space.png 79.8 KB

	dead-drag-space.png 79.8 KB View Download

Deleted: tab_dragging_dead_space.mov 1.6 MB

	tab_dragging_dead_space.mov 1.6 MB View Download