Chrome Version       : Version 58.0.3029.110 (64-bit)

What steps will reproduce the problem?
(1) Go to Chrome Settings > Customize fonts > Minimum font size
(2) Adjust the minimum font size up to 18px
(3) Go to "Reset settings" button, and reset settings
(4) Go back to Settings > Customize fonts > Minimum font size
(5) Notice that the "Minimum font size" was not reset to the default size

What is the expected result?
The "Minimum font size" should be reset to the default value like it was when Chrome was first installed.

What happens instead?
The "Minimum font size" is not reset to the default value. My browser's minimum font size had been increased, without my knowledge, and it was breaking a website I use. I reset my browser settings but the minimum font size was not being set back to the original default value. So the website was still broken.

Please provide any additional information below. Attach a screenshot if
possible.