After bug 1496622, the IDL parser converts some references to `nsresult` in IDL files to `::nserror::nsresult` in IDL-generated Rust files. But it doesn't convert others. It should convert them all consistently, and this patch makes it do so by adding conversion of the return type of attribute getters/setters and references generated by the IDL parser's Typedef class.
MozReview-Commit-ID: 838K8XGjvTx
Differential Revision: https://phabricator.services.mozilla.com/D10121
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extra : moz-landing-system : lando
9b692b9cbd