Bug 1577401 [wpt PR 18736] - Update interfaces/webauthn.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/webauthn.idl (#18736)

Source: https://github.com/tidoust/reffy-reports/blob/8f2fdfd/whatwg/idl/webauthn.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/578199200
--

wpt-commits: 802e3b2e35cf57c1fd53362fccfbffbd272222ef
wpt-pr: 18736

testing/web-platform/tests/interfaces/webauthn.idl

@@ -30,7 +30,7 @@ interface AuthenticatorResponse {
 [SecureContext, Exposed=Window]
 interface AuthenticatorAttestationResponse : AuthenticatorResponse {
     [SameObject] readonly attribute ArrayBuffer      attestationObject;
-    sequence<AuthenticatorTransport>                 getTransports();
+    sequence<DOMString>                              getTransports();
 };
 
 [SecureContext, Exposed=Window]
@@ -135,14 +135,15 @@ enum PublicKeyCredentialType {
 dictionary PublicKeyCredentialDescriptor {
     required PublicKeyCredentialType      type;
     required BufferSource                 id;
-    sequence<AuthenticatorTransport>      transports;
+    sequence<DOMString>                   transports;
 };
 
 enum AuthenticatorTransport {
     "usb",
     "nfc",
     "ble",
-    "internal"
+    "internal",
+    "lightning"
 };
 
 typedef long COSEAlgorithmIdentifier;