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

LayoutTests/crypto/jwk-import-use-values.html

Index: LayoutTests/crypto/jwk-import-use-values.html
diff --git a/LayoutTests/crypto/jwk-import-use-values.html b/LayoutTests/crypto/jwk-import-use-values.html
index 8b05e818d1e9bdf15968cd625d3e689caa72bdc5..b5dc0a0e34c63d4158284e00ca3773991ee12979 100644
--- a/LayoutTests/crypto/jwk-import-use-values.html
+++ b/LayoutTests/crypto/jwk-import-use-values.html
@@ -39,7 +39,7 @@ function testWithAESCBC(expectedUsages, jwkUsages, importUsages)
         aesKeyAsJSON.use = jwkUsages.use;
     }
 
-    return crypto.subtle.importKey("jwk", asciiToUint8Array(JSON.stringify(aesKeyAsJSON)), {name: "AES-CBC"}, extractable, importUsages).then(function(result) {
+    return crypto.subtle.importKey("jwk", aesKeyAsJSON, {name: "AES-CBC"}, extractable, importUsages).then(function(result) {
         key = result;
         debug(JSON.stringify(jwkUsages) + ":");
         shouldBe("key.usages", JSON.stringify(expectedUsages));
@@ -60,7 +60,7 @@ function testWithHMAC(expectedUsages, jwkUsages, importUsages)
         hmacKeyAsJSON.use = jwkUsages.use;
     }
 
-    return crypto.subtle.importKey("jwk", asciiToUint8Array(JSON.stringify(hmacKeyAsJSON)), {name: 'hmac', hash: {name: 'sha-256'}}, extractable, importUsages).then(function(result) {
+    return crypto.subtle.importKey("jwk", hmacKeyAsJSON, {name: 'hmac', hash: {name: 'sha-256'}}, extractable, importUsages).then(function(result) {
         key = result;
         debug(JSON.stringify(jwkUsages) + ":");
         shouldBe("key.usages", JSON.stringify(expectedUsages));