servo: Merge #17785 - Remove explicit lifetime arguments on a method …

…call (from servo:future-break); r=nox

This causes a warning it today’s Nightly: rust-lang/rust#42868

… which makes the build fail because we use `#![deny(warnings)]`. This warning is planned to become a hard error in a future Rust version.

Source-Repo: https://github.com/servo/servo
Source-Revision: 9597fec9fa82f4e64c2f28889d6865722cadcd5d

servo/components/style/stylesheets/stylesheet.rs

@@ -240,7 +240,7 @@ pub trait StylesheetInDocument {
         device: &'a Device,
         guard: &'a SharedRwLockReadGuard<'b>
     ) -> EffectiveRulesIterator<'a, 'b> {
-        self.iter_rules::<'a, 'b, EffectiveRules>(device, guard)
+        self.iter_rules::<EffectiveRules>(device, guard)
     }
 
     rule_filter! {