Like we did for RestyleManagerHandle and StyleSheetHandle, we should remove StyleSetHandle and replace it with a StyleSet base class.
status-firefox57=wontfix unless someone thinks this bug should block 57
status-firefox57: --- → wontfix
We should just remove StyleSetHandle at this point.
Status: NEW → RESOLVED
Last Resolved: 9 months ago
Resolution: --- → WONTFIX
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