1 Test that window.crypto.subtle wrapper preserves custom properties.
3 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
6 PASS [object Crypto] is defined.
7 PASS [object SubtleCrypto] is defined.
8 PASS anotherWindowCrypto.subtle.foo is "bar"
9 PASS successfullyParsed is true