[webcrypto] Implicitly set public keys to extractable.

content/renderer/webcrypto/webcrypto_impl_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 "content/renderer/webcrypto/webcrypto_impl.h"
 
 #include <cryptohi.h>
 #include <pk11pub.h>
 #include <sechash.h>
 
@@ skipping 737 matching lines @@
                                           &rsa_gen_params,
                                           &sec_public_key,
                                           attribute_flags,
                                           operation_flags,
                                           operation_flags_mask,
                                           NULL));
       if (!private_key) {
         return false;
       }
 
-      // One extractable input parameter is provided, and the Web Crypto API
-      // spec at this time says it applies to both members of the key pair.
-      // This is probably not correct: it makes more operational sense to have
-      // extractable apply only to the private key and make the public key
-      // always extractable. For now implement what the spec says and track the
-      // spec bug here: https://www.w3.org/Bugs/Public/show_bug.cgi?id=23695
       *public_key = blink::WebCryptoKey::create(
           new PublicKeyHandle(crypto::ScopedSECKEYPublicKey(sec_public_key)),
           blink::WebCryptoKeyTypePublic,
-          extractable,  // probably should be 'true' always
+          true,
           algorithm,
           usage_mask);
       *private_key = blink::WebCryptoKey::create(
           new PrivateKeyHandle(scoped_sec_private_key.Pass()),
           blink::WebCryptoKeyTypePrivate,
           extractable,
           algorithm,
           usage_mask);
 
       return true;
@@ skipping 152 matching lines @@
       break;
     }
     default:
       return false;
   }
 
   return true;
 }
 
 }  // namespace content