Upgrade to rustc 1.35.0-nightly (4c27fb19b 2019-03-25)

[SimonSapin]

This change is 

[highfive]

Heads up! This PR modifies the following files:

• @asajeffrey: components/script/dom/bindings/error.rs, components/script/dom/webglrenderingcontext.rs
• @KiChjang: components/script/dom/bindings/error.rs, components/script/dom/webglrenderingcontext.rs
• @emilio: components/style/bloom.rs, components/style/font_face.rs, components/style/stylist.rs

[highfive]

Warning

• These commits modify style and script code, but no tests are modified. Please consider adding a test!

[SimonSapin]

Extra careful review of the script_plugins change would be appreciated. rustc-internal APIs around HIR IDs have had a lot of churn lately, and with each change I grow less and less confident that the plugin still actually does what it was intended to do.

There is a unnecessary path disambiguator warning in components/config/tests/prefs.rs that is not caught by lints being denied (rust-lang/rust#58055), but applying the suggested chang “try removing ::” fails, possibly because this syn::Path macro input is used in two places: in a #foo::new() expression, and in a HashMap<String, #foo> type. I suspect one of them causes the warning when :: is used, and the other an error when it is not. Anyway, this warning is being removed entirely (rust-lang/rust#57565).

[Manishearth]

@bors-servo r+

the hir id change is pretty straightforward, it affected clippy too

[bors-servo]

📌 Commit 389e69b has been approved by Manishearth

[bors-servo]

⌛ Testing commit 389e69b with merge 5da1de6...

[bors-servo]

☀️ Test successful - android-mac, arm32, arm64, linux-rel-css, linux-rel-wpt, mac-rel-css1, mac-rel-css2, mac-rel-wpt1, mac-rel-wpt2, mac-rel-wpt3, mac-rel-wpt4, magicleap, status-taskcluster
Approved by: Manishearth
Pushing 5da1de6 to master...