Auto merge of #18658 - canaltinova:font-size-quirk, r=Manishearth
Auto merge of #18658 - canaltinova:font-size-quirk, r=Manishearth

stylo: Handle quirks mode on font base sizes

We should use different font size mapping for quirks mode.

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix [Bug 1401322](https://bugzilla.mozilla.org/show_bug.cgi?id=1401322)

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