[webcrypto] Match the error handling defined by the spec.

LayoutTests/crypto/importKey-expected.txt

Index: LayoutTests/crypto/importKey-expected.txt
diff --git a/LayoutTests/crypto/importKey-expected.txt b/LayoutTests/crypto/importKey-expected.txt
index f8446074d0e656b6c3cb4233aeb15082d5b39068..0b13c2df25645416e1a88f86e32c1a548d5ba863 100644
--- a/LayoutTests/crypto/importKey-expected.txt
+++ b/LayoutTests/crypto/importKey-expected.txt
@@ -1,3 +1,4 @@
+CONSOLE ERROR: Algorithm: HMAC: HmacParams: hash: Missing or not a dictionary
 Tests cypto.subtle.importKey.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
@@ -23,8 +24,8 @@ PASS crypto.subtle.importKey(keyFormat, data, algorithm, extractable, ['SIGN'])
 PASS crypto.subtle.importKey('invalid format', data, algorithm, extractable, ['SIGN']) threw exception TypeError: Failed to execute 'importKey' on 'SubtleCrypto': Invalid keyFormat argument.
 PASS crypto.subtle.importKey(keyFormat, [], algorithm, extractable, keyUsages) threw exception TypeError: Failed to execute 'importKey' on 'SubtleCrypto': Invalid keyData argument.
 PASS crypto.subtle.importKey(keyFormat, null, algorithm, extractable, keyUsages) threw exception TypeError: Failed to execute 'importKey' on 'SubtleCrypto': Invalid keyData argument.
-PASS crypto.subtle.importKey(keyFormat, data, {name: 'hmac'}, extractable, keyUsages) threw exception TypeError: Failed to execute 'importKey' on 'SubtleCrypto': Algorithm: HMAC: HmacParams: hash: Missing or not a dictionary.
 PASS crypto.subtle.importKey(keyFormat, data, {name: 'sha-1'}, extractable, keyUsages) threw exception NotSupportedError: Failed to execute 'importKey' on 'SubtleCrypto': Algorithm: SHA-1: Unsupported operation.
+PASS: 'crypto.subtle.importKey(keyFormat, data, {name: 'hmac'}, extractable, keyUsages)' rejected with null
 PASS successfullyParsed is true
 
 TEST COMPLETE