b40aae54b7
In some cases (unclear when), traceviewer-js, used by Lighthouse under the hood, assumes `atob`/`btoa` are defined in the global scope. This is true for browser environments, but not on node. As a result, some aggregations that required access to model-tracing failed to produce results, dropping the overall PWA score. This affected #16665 (e.g. commit 0de6eec7a).