Franklin Yu dd09ab28f3 [gapi.auth2] mark a parameter as optional ...

According to the [documentation][], this parameter is optional.

[documentation]: https://developers.google.com/identity/sign-in/web/reference#googleauthgrantofflineaccessoptions

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gapi.auth2-tests.ts

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index.d.ts

[gapi.auth2] mark a parameter as optional

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tsconfig.json

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