[webcrypto] Refactor some layout tests.

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
new file mode 100644
index 0000000000000000000000000000000000000000..a975e6a50467a36fd29b149fa69d6849f96837da
--- /dev/null
+++ b/LayoutTests/crypto/aes-ctr-parseAlgorithm-failures-expected.txt
@@ -0,0 +1,21 @@
+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
+PASS successfullyParsed is true
+
+TEST COMPLETE
+