Version: Version 52.0.2743.24 beta (64-bit)
OS: Mac OSX Yosemite (but likely on others). My desktop width is 1440 pixels.

What steps will reproduce the problem?
(1) create more than 6 profiles (on 1440px wide OSX desktop, possibly more on wider displays)
(2) open profile switcher

What is the expected output?

See all the profiles or some indication that there are more profiles that could not fit (overflow).

What do you see instead?

No indicator of overflow.

Please use labels and text to provide additional information.