servo: Merge #8862 - Moved WorkerId type to devtools_traits (from fstr:move_workerid); r=Ms2ger

Fixes #8846.

Source-Repo: https://github.com/servo/servo
Source-Revision: 02f4be9c9f82a6e03942977eece39d98dcaff839

servo/components/msg/constellation_msg.rs

@@ -450,9 +450,6 @@ pub enum NavigationDirection {
 #[derive(Clone, PartialEq, Eq, Copy, Hash, Debug, Deserialize, Serialize)]
 pub struct FrameId(pub u32);
 
-#[derive(Clone, PartialEq, Eq, Copy, Hash, Debug, Deserialize, Serialize, HeapSizeOf)]
-pub struct WorkerId(pub u32);
-
 /// Each pipeline ID needs to be unique. However, it also needs to be possible to
 /// generate the pipeline ID from an iframe element (this simplifies a lot of other
 /// code that makes use of pipeline IDs).