Xidorn Quan 26a9861563 Bug 1449103 part 2 - Make CSSKeyframesRule inherit from Rule directly. r=emilio ...

The spec doesn't say CSSKeyframesRule needs to inherit CSSGroupingRule.
It inherited GroupRule because Gecko's keyframes rule implementation
relies on that to manage its children.

MozReview-Commit-ID: CnVP2tozwQU

2018-03-28 12:23:58 +11:00

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