[WebAuthN] Remove hash from Client Data

[WebAuthN] Remove hash from Client Data
https://bugs.webkit.org/show_bug.cgi?id=192727
<rdar://problem/46746673>

Reviewed by Brent Fulgham.

Source/WebCore:

The hash algorithm for hashing the client data is enforced to SHA_256 in the latest spec:
https://www.w3.org/TR/webauthn/#sec-client-data. Therefore, we should remove it.

Covered by existing tests.

* Modules/webauthn/AuthenticatorCoordinator.cpp:
(WebCore::AuthenticatorCoordinatorInternal::produceClientDataJson):

LayoutTests:

* http/wpt/webauthn/public-key-credential-create-success-hid.https.html:
* http/wpt/webauthn/public-key-credential-create-success-local.https.html:
* http/wpt/webauthn/public-key-credential-get-success-hid.https.html:
* http/wpt/webauthn/public-key-credential-get-success-local.https.html:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@239471 268f45cc-cd09-0410-ab3c-d52691b4dbfc