Google Chrome	65.0.3325.184 (Official Build) (64-bit)
Platform	10323.62.0 (Official Build) stable-channel panther

What steps will reproduce the problem?
(1) Attach a mouse with a built-in back button (e.g. [1]) to a panther Chromebox.
(2) Navigate a sequence of pages.
(3) Press and release the back button once.

[1] https://www.microsoft.com/accessories/en-us/products/mice/sculpt-ergonomic-mouse/l6v-00001


What is the expected result?
The current tab goes back one page.


What happens instead?
The current tab goes back two pages.