Replace Atom::from_slice("sizes") with atom!("sizes")

[r-52]

This PR replaces all occurrences of Atom::from_slice("sizes") with atom!("sizes"). It also updates string_cache to v0.1.17 from 0.1.16.

Right now I've split the crate update and the replace in different commits - should I squash them?

Fixes #8488.

[Ms2ger]

Thanks a lot! One small nit below.

-S-awaiting-review +S-needs-code-changes

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Reviewed 3 of 3 files at r1, 1 of 1 files at r2.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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^{components/script/dom/htmllinkelement.rs, line 133 [r2] (raw file):}
This could just be &atom!("sizes") now.

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Comments from the review on Reviewable.io

[r-52]

Thanks - I've updated the PR

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Comments from the review on Reviewable.io

[Ms2ger]

Reviewed 1 of 1 files at r3.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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^{components/script/dom/htmllinkelement.rs, line 129 [r3] (raw file):}
Sorry, I didn't notice this earlier. We can replace this use by its definition too.

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Comments from the review on Reviewable.io

[r-52]

^{components/script/dom/htmllinkelement.rs, line 129 [r3] (raw file):}
No problem - thank you for the review!

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Comments from the review on Reviewable.io

[Ms2ger]

Thanks again!

@bors-servo r+

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Reviewed 1 of 1 files at r4.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from the review on Reviewable.io

[bors-servo]

📌 Commit 0813ee7 has been approved by Ms2ger

[bors-servo]

⌛ Testing commit 0813ee7 with merge c722e0e...

[bors-servo]

☀️ Test successful - android, gonk, linux-dev, linux-rel, mac-dev-ref-unit, mac-rel-css, mac-rel-wpt