Move `MozBrowserEvent` to `script_traits`

[apopiak]

close #9225

[highfive]

Thanks for the pull request, and welcome! The Servo team is excited to review your changes, and you should hear from @Ms2ger (or someone else) soon.

[apopiak]

sry, overlooked the WIP and the rebase

[KiChjang]

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

Thanks for taking up the issue! A couple of minor nits and this can be merged :)

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Reviewed 10 of 10 files at r1.
Review status: all files reviewed at latest revision, 9 unresolved discussions.

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components/compositing/constellation.rs, line 33 [r1] (raw file):
nit: Remove the braces and meld into next/previous line.

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components/compositing/constellation.rs, line 49 [r1] (raw file):
nit: Meld into next line.

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components/compositing/pipeline.rs, line 28 [r1] (raw file):
nit: Meld into previous line.

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components/script/dom/htmliframeelement.rs, line 29 [r1] (raw file):
nit: Meld into next line.

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components/script/dom/htmliframeelement.rs, line 34 [r1] (raw file):
nit: Combine IFrameLoadInfo, MozBrowserEvent and ScriptMsg as ConstellationMsg into one line.

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components/script/dom/htmllinkelement.rs, line 27 [r1] (raw file):
nit: Remove the braces.

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components/script/dom/htmllinkelement.rs, line 30 [r1] (raw file):
nit: Meld into next line.

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components/script/dom/window.rs, line 60 [r1] (raw file):
nit: Meld into next line.

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components/script/script_thread.rs, line 86 [r1] (raw file):
nit: Meld into next/previous line.

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Comments from the review on Reviewable.io

[KiChjang]

-S-awaiting-review

All good! Thanks for taking the time to work on this!

@bors-servo r+

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Reviewed 7 of 7 files at r2.
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 0fb0615 has been approved by KiChjang

[bors-servo]

⌛ Testing commit 0fb0615 with merge 8590779...

[bors-servo]

💔 Test failed - mac-rel-wpt

[nox]

@bors-servo retry

Git snafu.

[bors-servo]

🔒 Merge conflict

[bors-servo]

☔ The latest upstream changes (presumably #9279) made this pull request unmergeable. Please resolve the merge conflicts.

[apopiak]

rebased

[KiChjang]

@bors-servo r+

[bors-servo]

📌 Commit 79e69c9 has been approved by KiChjang

[apopiak]

@KiChjang and another commit --amend because the rebase wasn't clean (I left a doubling of DocumentState in)

[KiChjang]

@bors-servo r+

[bors-servo]

📌 Commit 4b773ce has been approved by KiChjang

[bors-servo]

⌛ Testing commit 4b773ce with merge 897007f...

[bors-servo]

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