Update JWK output to match latest draft

net/cert/jwk_serializer_nss.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/cert/jwk_serializer.h"
 
 #include <cert.h>
 #include <keyhi.h>
 #include <nss.h>
 
@@ skipping 12 matching lines @@
     CERTSubjectPublicKeyInfo* spki,
     base::DictionaryValue* public_key_jwk) {
   static const int kUncompressedEncodingType = 4;
   static const int kPrime256v1PublicKeyLength = 64;
   // The public key value is encoded as 0x04 + 64 bytes of public key.
   // NSS gives the length as the bit length.
   if (spki->subjectPublicKey.len != (kPrime256v1PublicKeyLength + 1) * 8 ||
       spki->subjectPublicKey.data[0] != kUncompressedEncodingType)
     return false;
 
-  public_key_jwk->SetString("alg", "EC");
+  public_key_jwk->SetString("kty", "EC");
   public_key_jwk->SetString("crv", "P-256");
 
   base::StringPiece x(
       reinterpret_cast<char*>(spki->subjectPublicKey.data + 1),
       kPrime256v1PublicKeyLength / 2);
   std::string x_b64;
   base::Base64Encode(x, &x_b64);
   public_key_jwk->SetString("x", x_b64);
 
   base::StringPiece y(
@@ skipping 65 matching lines @@
               sizeof(kIdEcPublicKey))) {
     rv = ConvertEcPublicKeyInfoToJwk(spki.get(), public_key_jwk);
   }
   // TODO(juanlang): other algorithms
   return rv;
 }
 
 }  // namespace JwkSerializer
 
 }  // namespace net