Merge externs fixes into legacy-undefined-noBatch

Polymer / polymer

Our original Web Component library.

https://polymer-library.polymer-project.org/

BSD 3-Clause "New" or "Revised" License

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Closed aomarks closed 5 years ago

aomarks commented 5 years ago

Merges https://github.com/Polymer/polymer/pull/5550 into the legacy-undefined-noBatch branch.