crypto: remove non-standard `webcrypto.Crypto.prototype.CryptoKey`

`CryptoKey` is already available on the global object.

PR-URL: https://github.com/nodejs/node/pull/42083
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

lib/internal/crypto/webcrypto.js

@@ -5,6 +5,7 @@ const {
   JSONParse,
   JSONStringify,
   ObjectDefineProperties,
+  ObjectDefineProperty,
   ReflectApply,
   ReflectConstruct,
   SafeSet,
@@ -28,6 +29,10 @@ const {
   validateString,
 } = require('internal/validators');
 
+const {
+  getOptionValue,
+} = require('internal/options');
+
 const { TextDecoder, TextEncoder } = require('internal/encoding');
 
 const {
@@ -792,15 +797,20 @@ ObjectDefineProperties(
       writable: true,
       value: randomUUID,
     },
-    CryptoKey: {
-      __proto__: null,
-      enumerable: true,
-      configurable: true,
-      writable: true,
-      value: CryptoKey,
-    }
   });
 
+if (getOptionValue('--no-experimental-global-webcrypto')) {
+  // For backward compatibility, keep exposing CryptoKey in the Crypto prototype
+  // when using the flag.
+  ObjectDefineProperty(Crypto.prototype, 'CryptoKey', {
+    __proto__: null,
+    enumerable: true,
+    configurable: true,
+    writable: true,
+    value: CryptoKey,
+  });
+}
+
 ObjectDefineProperties(
   SubtleCrypto.prototype, {
     [SymbolToStringTag]: {

test/parallel/test-crypto-subtle-zero-length.js

@@ -15,7 +15,7 @@ const crypto = require('crypto').webcrypto;
     { name: 'AES-GCM' },
     false,
     [ 'encrypt', 'decrypt' ]);
-  assert(k instanceof crypto.CryptoKey);
+  assert(k instanceof CryptoKey);
 
   const e = await crypto.subtle.encrypt({
     name: 'AES-GCM',

test/parallel/test-webcrypto-keygen.js

@@ -9,7 +9,7 @@ if (!common.hasCrypto)
 const assert = require('assert');
 const { types: { isCryptoKey } } = require('util');
 const {
-  webcrypto: { subtle, CryptoKey },
+  webcrypto: { subtle },
   createSecretKey,
   KeyObject,
 } = require('crypto');