rust-mozjs

2e4c6a82 - Auto merge of #549 - yvt:feat-js-principals, r=jdm

Auto merge of #549 - yvt:feat-js-principals, r=jdm Bring `RustJSPrincipals` back It was added as `RustJSPrincipal` in commit dea774c and then removed in commit 98ebda0.