[webcrypto] Refactor some layout tests.

LayoutTests/crypto/aes-cbc-decrypt-failure-expected.txt

Index: LayoutTests/crypto/aes-cbc-decrypt-failure-expected.txt
diff --git a/LayoutTests/fast/forms/time-multiple-fields/time-multiple-fields-focus-expected.txt b/LayoutTests/crypto/aes-cbc-decrypt-failure-expected.txt
similarity index 27%
copy from LayoutTests/fast/forms/time-multiple-fields/time-multiple-fields-focus-expected.txt
copy to LayoutTests/crypto/aes-cbc-decrypt-failure-expected.txt
index 350c612d216809bed95e10509ac6bb18121ad181..501c8656194b01d8eb45dc8fae179c609b5d47af 100644
--- a/LayoutTests/fast/forms/time-multiple-fields/time-multiple-fields-focus-expected.txt
+++ b/LayoutTests/crypto/aes-cbc-decrypt-failure-expected.txt
@@ -1,14 +1,16 @@
-Check if focus() for focused input does not change focused sub-field.
+Decrypting truncated AES-CBC ciphertext should fail
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-Move focus to the second sub-field:
-PASS document.activeElement is timeInput
-PASS shadowPseudoIdOfFocused(timeInput) is "-webkit-datetime-edit-minute-field"
-PASS timeInput.focus(); shadowPseudoIdOfFocused(timeInput) is "-webkit-datetime-edit-minute-field"
-Click on a delimiter between sub-fields, then check if focused element is not changed:
-PASS shadowPseudoIdOfFocused(timeInput) is "-webkit-datetime-edit-minute-field"
+PASS: Decryption succeeded
+PASS: decrypting failed. ciphertext length: 0
+PASS: decrypting failed. ciphertext length: 79
+PASS: decrypting failed. ciphertext length: 64
+PASS: decrypting failed. ciphertext length: 1
+PASS: decrypting failed. ciphertext length: 15
+PASS: decrypting failed. ciphertext length: 16
+PASS: decrypting failed. ciphertext length: 17
 PASS successfullyParsed is true
 
 TEST COMPLETE