Blink-layer update to match WebAuthN spec

third_party/WebKit/Source/modules/webauth/PublicKeyCredentialDescriptor.idl

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// https://w3c.github.io/webauthn/#enumdef-externaltransport
+// https://w3c.github.io/webauthn/#enumdef-authenticatortransport
 
 enum Transport {
     "usb",
     "nfc",
     "ble"
 };
 
-// https://w3c.github.io/webauthn/#dictdef-scopedcredentialdescriptor
+// https://w3c.github.io/webauthn/#dictdef-publickeycredentialdescriptor
 
-dictionary ScopedCredentialDescriptor {
-    required ScopedCredentialType type;
+dictionary PublicKeyCredentialDescriptor {
+    required PublicKeyCredentialType type;
     required BufferSource id;
     sequence<Transport> transports;
 };