As part of #40600 we need to replace structuredclone::write SafeJSContext usage with &mut JSContext.
Before that we must first convert all callers to accept &mut JSContext and start propagating it:

• script: use &mut JSContext inside workers PostMessage api #42342
• WorkerGlobalScope::StructuredClone and Window::StructuredClone
• Script: Use &mut JSContext in BroadcastChannel::PostMessage #42417
• MessagePort::PostMessage
• script: use &mut JSContext in Window::PostMessage #42370
• History::PushState and History::ReplaceState
• DissimilarOriginWindowMethods::PostMessage

To avoid work duplication, please leave a comment with the chosen task.
For each interface you need to update its entry inside Binding.conf, you can take cues from #42342 and this guide.