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

LayoutTests/crypto/rsa-export-key.html

Index: LayoutTests/crypto/rsa-export-key.html
diff --git a/LayoutTests/crypto/rsa-export-key.html b/LayoutTests/crypto/rsa-export-key.html
index a4dd526a5df82be83506f4b3bacd864ca046eac3..cfd4ba6838a027d02ff92c1fe582cef6e31da88e 100644
--- a/LayoutTests/crypto/rsa-export-key.html
+++ b/LayoutTests/crypto/rsa-export-key.html
@@ -23,10 +23,8 @@ var publicKeyJSON = {
     e: "AQAB"
 };
 
-var jwkKeyAsArrayBuffer = asciiToUint8Array(JSON.stringify(publicKeyJSON));
-
 debug("\nImporting a JWK key...");
-crypto.subtle.importKey("jwk", jwkKeyAsArrayBuffer, {name: "RSASSA-PKCS1-v1_5", hash: {name: "sha-256"}}, extractable, ['verify']).then(function(result) {
+crypto.subtle.importKey("jwk", publicKeyJSON, {name: "RSASSA-PKCS1-v1_5", hash: {name: "sha-256"}}, extractable, ['verify']).then(function(result) {
     key = result;
 
     return crypto.subtle.exportKey(null, key);