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- Implements MediaQueryListEvent interface
- Makes MediaQueryList change events conform to the [spec](https://drafts.csswg.org/cssom-view/#evaluate-media-queries-and-report-changes)
- Updates matchMedia.html test to verify that the new event type is used
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Source-Repo: https://github.com/servo/servo
Source-Revision: bcf154d8e6761737627bd28f47d2e9458b2c024a
<!-- Please describe your changes on the following line: -->
`MediaList` is the name of the interface for "collection of media queries" used in [CSSOM spec](https://drafts.csswg.org/cssom/#the-medialist-interface), `MediaQueryList` happens to mean something different in [CSSOM View spec](https://drafts.csswg.org/cssom-view/#the-mediaquerylist-interface), which also leads to naming conflict in dom code. So I think it's better renaming it to `MediaList`.
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Source-Repo: https://github.com/servo/servo
Source-Revision: 56b4065ee83b3afb420fd6119685ba975f143885
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This will allow types to be generic over our local `ToCss`
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Source-Revision: f48b3fe2197a59b29bc711fb1b5496cbb97bd330
I did #14065
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Fixes#13376.
Source-Repo: https://github.com/servo/servo
Source-Revision: 6ef46ab9e4ec08d5f5226d41f0cac77c3584bae9
