Generalise RootedVec::<JS<T>>::r as [JS<T>]::r

[nox]

This change is

[highfive]

Heads up! This PR modifies the following files:

• @KiChjang: components/script/dom/bindings/global.rs, components/script/dom/htmldatalistelement.rs, components/script/dom/htmlformcontrolscollection.rs, components/script/dom/htmlimageelement.rs, components/script/dom/navigator.rs, components/script/dom/htmlcollection.rs, components/script/dom/treewalker.rs, components/script/dom/nodeiterator.rs, components/script/parse/mod.rs, components/script/dom/filereader.rs, components/script/dom/htmlselectelement.rs, components/script/dom/htmlcanvaselement.rs, components/script/dom/servohtmlparser.rs, components/script/dom/blob.rs, components/script/dom/bluetoothdevice.rs, components/script/devtools.rs, components/script/dom/bluetoothremotegattserver.rs, components/script/dom/document.rs, components/script/dom/domquad.rs, components/script/dom/bindings/refcounted.rs, components/script/dom/eventtarget.rs, components/script/timers.rs, components/script/dom/bindings/callback.rs, components/script/dom/domstringmap.rs, components/script/dom/htmltablecellelement.rs, components/script/dom/webglprogram.rs, components/script/dom/htmlobjectelement.rs, components/script/dom/bindings/codegen/CodegenRust.py, components/script/dom/htmlbuttonelement.rs, components/script/dom/activation.rs, components/script/dom/htmloutputelement.rs, components/script/dom/htmlstyleelement.rs, components/script/dom/bluetoothremotegattservice.rs, components/script/dom/dedicatedworkerglobalscope.rs, components/script/dom/htmldetailselement.rs, components/script/dom/comment.rs, components/script/dom/bluetooth.rs, components/script/dom/bluetoothremotegattdescriptor.rs, components/script/dom/bindings/js.rs, components/script/dom/bluetoothremotegattcharacteristic.rs, components/script/dom/domimplementation.rs, components/script/dom/testbinding.rs, components/script/dom/performancetiming.rs, components/script/dom/htmliframeelement.rs, components/script/dom/console.rs, components/script/dom/url.rs, components/script/dom/canvasrenderingcontext2d.rs, components/script/dom/worker.rs, components/script/dom/htmlformelement.rs, components/script/dom/webglrenderingcontext.rs, components/script/dom/bindings/trace.rs, components/script/dom/documentfragment.rs, components/script/dom/websocket.rs, components/script/dom/domparser.rs, components/script/dom/domtokenlist.rs, components/script/dom/formdata.rs
• @emilio: components/script/dom/webglprogram.rs, components/script/dom/webglrenderingcontext.rs

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Warning

• These commits modify unsafe code. Please review it carefully!
• These commits modify script code, but no tests are modified. Please consider adding a test!

[nox]

This supersedes #11162.

[nox]

r? @Ms2ger

[highfive]

New code was committed to pull request.

[Ms2ger]

Fine by me, r? @jdm for the extra uses.

[KiChjang]

Fails tidy:

Checking files for tidiness...

./components/script/dom/bindings/callback.rs:9: use statement is not in alphabetical order

    expected: dom::bindings::js::RootedReference

    found: dom::bindings::global::global_root_from_object

[highfive]

New code was committed to pull request.

[bors-servo]

☔ The latest upstream changes (presumably #11192) made this pull request unmergeable. Please resolve the merge conflicts.

[highfive]

New code was committed to pull request.

[jdm]

I'm not convinced that this is a strict improvement. Conceptually the implementation is nicer to read, but the extra import required for every file that needs to interact with a GlobalRoot is a papercut that outweighs that.

[bors-servo]

☔ The latest upstream changes (presumably #11231) made this pull request unmergeable. Please resolve the merge conflicts.

[notriddle]

So, what's the status on this one? Is it just a change we don't want to make at all? Or should it be rebased and fixed up in some way? @jdm?

[jdm]

Previous discussions have not convinced me that this change is worth merging.