[webcrypto] Change HMAC key generation length from bytes to bits.

LayoutTests/crypto/generateKey-expected.txt

Index: LayoutTests/crypto/generateKey-expected.txt
diff --git a/LayoutTests/crypto/generateKey-expected.txt b/LayoutTests/crypto/generateKey-expected.txt
index 7029d4d7ff9c2b3d40192b41dfe8cdc41e9b06eb..51f2e21d7ac4bb4dbb142b53518afb77bd354548 100644
--- a/LayoutTests/crypto/generateKey-expected.txt
+++ b/LayoutTests/crypto/generateKey-expected.txt
@@ -20,6 +20,7 @@ CONSOLE ERROR: Algorithm: HMAC: HmacKeyGenParams: length: Outside of numeric ran
 CONSOLE ERROR: Algorithm: HMAC: HmacKeyGenParams: length: Is not a number
 CONSOLE ERROR: Algorithm: HMAC: HmacKeyGenParams: length: Is not a number
 CONSOLE ERROR: Invalid key length: it is either zero or not a multiple of 8 bits
+CONSOLE ERROR: Invalid key length: it is either zero or not a multiple of 8 bits
 CONSOLE ERROR: Algorithm: RSASSA-PKCS1-v1_5: RsaHashedKeyGenParams: modulusLength: Outside of numeric range
 CONSOLE ERROR: Algorithm: RSASSA-PKCS1-v1_5: RsaHashedKeyGenParams: modulusLength: Is not a number
 CONSOLE ERROR: Algorithm: RSASSA-PKCS1-v1_5: RsaHashedKeyGenParams: modulusLength: Missing required property
@@ -61,6 +62,7 @@ PASS: 'crypto.subtle.generateKey({name: 'hmac', hash: {name: 'sha-256'}, length:
 PASS: 'crypto.subtle.generateKey({name: 'hmac', hash: {name: 'sha-256'}, length: crypto}, extractable , keyUsages)' rejected with null
 PASS: 'crypto.subtle.generateKey({name: 'hmac', hash: {name: 'sha-256'}, length: undefined}, extractable , keyUsages)' rejected with null
 PASS: 'crypto.subtle.generateKey({name: 'hmac', hash: {name: 'sha-256'}, length: null}, extractable , keyUsages)' rejected with null
+PASS: 'crypto.subtle.generateKey({name: 'hmac', hash: {name: 'sha-256'}, length: true}, extractable , keyUsages)' rejected with null
 PASS: 'crypto.subtle.generateKey({name: 'RSASSA-PKCS1-v1_5', modulusLength: -30}, extractable , keyUsages)' rejected with null
 PASS: 'crypto.subtle.generateKey({name: 'RSASSA-PKCS1-v1_5', modulusLength: NaN}, extractable , keyUsages)' rejected with null
 PASS: 'crypto.subtle.generateKey({name: 'RSASSA-PKCS1-v1_5'}, extractable , keyUsages)' rejected with null
@@ -74,7 +76,6 @@ PASS: 'crypto.subtle.generateKey({name: 'RSAES-PKCS1-v1_5', modulusLength: 10},
 PASS: 'crypto.subtle.generateKey({name: 'RSAES-PKCS1-v1_5', modulusLength: 10, publicExponent: 10}, extractable , keyUsages)' rejected with null
 PASS: 'crypto.subtle.generateKey({name: 'RSAES-PKCS1-v1_5', modulusLength: 10, publicExponent: null}, extractable , keyUsages)' rejected with null
 PASS: 'crypto.subtle.generateKey({name: 'hmac', hash: {name: 'sha-256'}, length: '48'}, extractable , keyUsages)' accepted with [object Key]
-PASS: 'crypto.subtle.generateKey({name: 'hmac', hash: {name: 'sha-256'}, length: true}, extractable , keyUsages)' accepted with [object Key]
 PASS successfullyParsed is true
 
 TEST COMPLETE