Added Chinese character support for native webkit

[asaAnnabelle]

Native webkit doesn't add Safari version in the useragent string. This PR checks for the existence of webkit engine in that string. This fixes a varity of issues including autocompleting Chinese characters.

Before:

Chinese.character.before.mov

After:

Chinese.characters.work.mov

[vercel]

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[trueadm]

Thank you.

[trueadm]

However, it looks like this is causing e2e tests to fail?

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[acywatson]

Thank you!