[webcrypto] Reject failed operations with a DOMException rather than null.

LayoutTests/crypto/aes-ctr-parseAlgorithm-failures-expected.txt

Index: LayoutTests/crypto/aes-ctr-parseAlgorithm-failures-expected.txt
diff --git a/LayoutTests/crypto/aes-ctr-parseAlgorithm-failures-expected.txt b/LayoutTests/crypto/aes-ctr-parseAlgorithm-failures-expected.txt
index a975e6a50467a36fd29b149fa69d6849f96837da..1646083b1b6bdcf7846b51e5affd07d39348cb30 100644
--- a/LayoutTests/crypto/aes-ctr-parseAlgorithm-failures-expected.txt
+++ b/LayoutTests/crypto/aes-ctr-parseAlgorithm-failures-expected.txt
@@ -1,20 +1,14 @@
-CONSOLE ERROR: Algorithm: AES-CTR: AesCtrParams: counter: Not an ArrayBufferView
-CONSOLE ERROR: Algorithm: AES-CTR: AesCtrParams: counter: Missing required property
-CONSOLE ERROR: Algorithm: AES-CTR: AesCtrParams: length: Missing required property
-CONSOLE ERROR: Algorithm: AES-CTR: AesCtrParams: length: Outside of numeric range
-CONSOLE ERROR: Algorithm: AES-CTR: AesCtrParams: length: Outside of numeric range
-CONSOLE ERROR: Algorithm: AES-CTR: AesCtrParams: length: Outside of numeric range
 Tests bad algorithm inputs for AES-CTR
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS error is null
-PASS error is null
-PASS error is null
-PASS error is null
-PASS error is null
-PASS error is null
+error is: SyntaxError: AesCtrParams: counter: Not an ArrayBufferView
+error is: SyntaxError: AesCtrParams: counter: Missing required property
+error is: SyntaxError: AesCtrParams: length: Missing required property
+error is: SyntaxError: AesCtrParams: length: Outside of numeric range
+error is: SyntaxError: AesCtrParams: length: Outside of numeric range
+error is: SyntaxError: AesCtrParams: length: Outside of numeric range
 PASS successfullyParsed is true
 
 TEST COMPLETE