Normalize usage list in generateKey operations

[kkoyung]

Found from the recent changes (web-platform-tests/wpt#61397) in WPT.

For the generateKey operations of symmetric key algorithms (AES-CTR, AES-CBC, AES-GCM, AES-KW and HMAC), we should normalize the usage list assigned to the [[usages]] internal slot of the new CryptoKey.

Note that, for the generateKey operations of asymmetric key algorithms (RSASSA-PKCS1-v1_5, RSA-PSS, RSA-OAEP, ECDH, ECDSA, Ed25519 and X25519), the usage lists assigned to the [[usages]] internal slots of the new CryptoKey are already normalized by the usage intersection (https://w3c.github.io/webcrypto/#concept-usage-intersection).

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[twiss]

Thanks for the PRs! Could you please either join the WebAppSec and WICG groups, or mark your PRs as non-substantive?

[w3cbot]

kkoyung marked as non substantive for IPR from ash-nazg.

[kkoyung]

If you do not work for a W3C Member organization, first consider whether your employer can join W3C and get the benefits of Membership.

If this is not an option and you think that you have the expertise and availability to participate, you may request to participate as an Invited Expert as follows.
Note: Your application is subject to approval by the Chairs and Staff Contacts of this group. Please contact Simone Onofri to discuss your intent to complete an application before starting the process.

I'm not an employee of any W3C member organization. It seems I need to get some approval to join the groups, which will take time. Perhaps it would be simpler to just mark the PRs as non-substantive.