[webcrypto] Require importKey() for JWK to provide data as a Javascript object rather than a JSON a…

LayoutTests/crypto/hmac-import-jwk.html

Index: LayoutTests/crypto/hmac-import-jwk.html
diff --git a/LayoutTests/crypto/hmac-import-jwk.html b/LayoutTests/crypto/hmac-import-jwk.html
index 93f7273521fcfccf07c6b6a8691c0539a77c4226..bc990b3c93841eccdb75d272edc191a28064cec1 100644
--- a/LayoutTests/crypto/hmac-import-jwk.html
+++ b/LayoutTests/crypto/hmac-import-jwk.html
@@ -24,10 +24,8 @@ var hmacKey = {
     "k": "ahjkn-_387fgnsibf23qsvahjkn-_387fgnsibf23qs"
 };
 
-var hmacKeyAsArrayBuffer = asciiToUint8Array(JSON.stringify(hmacKey));
-
 debug("Importing a key...\n");
-crypto.subtle.importKey("jwk", hmacKeyAsArrayBuffer, {name: "HMAC", hash: {name: "SHA-256"}}, nonExtractable, ["sign", "verify"]).then(function(result) {
+crypto.subtle.importKey("jwk", hmacKey, {name: "HMAC", hash: {name: "SHA-256"}}, nonExtractable, ["sign", "verify"]).then(function(result) {
     key = result;
 
     shouldBe("key.type", "'secret'");