Increase the size of the style sharing cache to 31
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The idea is to put the memmoving of the ThreadLocalContext out of line from the point of view of top_down_dom so we don't need to allocate a large chunk of stack space for it.
Fix revalidation selectors when pseudo-elements are involved.
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Don't accept an extra token at the end of transform property
The lack of `input.try` usage makes transform property to accept values like `rotate(70deg)foo`.
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Removed root browsing context from constellation
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Removed the special root browsing context from the constellation.
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Parallel layout optimizations
This takes some of the optimizations made to parallel styling in #16971 and applies them to parallel layout. Specifically:
* Reduce the chunk size, to increase chances for parallelism on trees with small fan-out.
* Reduce allocations by using SmallVec.
* Reduce task switching by processing up to one chunk of children within the same rayon task as the parent.
This cuts the "Primary Layout Pass" time in **half** on the MySpace page from [tp5n], and on my other real-world test pages it is a small improvement or close to no change.
[tp5n]: https://wiki.mozilla.org/Buildbot/Talos/Tests#tp5n_pages_set
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Count number of braces on a line when checking spec links in test-tidy
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Allow more than one brace per line when checking spec links in test-tidy.
We had problems caused by `if unsafe { ... } {`.
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Back out https://github.com/servo/servo/pull/17198 for Gecko test failures
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