Lighthouse treats "shrink-to-fit" property in meta-tag "viewport" as invalid

[hmelenok]

Fix for #2474

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[hmelenok]

I signed it!

[googlebot]

CLAs look good, thanks!

[paulirish]

The package.json change looks great, but the yarn.lock diff is much bigger than i'd expect.

want to try that part again?

[hmelenok]

Hey @paulirish, thanks to check it out. It's fixed

[paulirish]

thanks very much for making this happen in both projects!