Chrome Version: (copy from chrome://version)
72.0.3606.0 (Official Build) canary (64-bit)

OS: (e.g. Win10, MacOS 10.12, etc...)
Mac, CrOS

What steps will reproduce the problem?
(1) open chrome://settings/fonts
(2) scroll to fixed width font

What is the expected result?

example rendering should be 16pt

What happens instead?

it's smaller

https://screenshot.googleplex.com/Rs7FUFwWKtj

Please use labels and text to provide additional information.

If this is a regression (i.e., worked before), please consider using the
bisect tool (https://www.chromium.org/developers/bisect-builds-py) to help
us identify the root cause and more rapidly triage the issue.

For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.