[webcrypto] Disable RSA key import for NSS versions less than 3.16.2.

content/child/webcrypto/status.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_CHILD_WEBCRYPTO_STATUS_H_
 #define CONTENT_CHILD_WEBCRYPTO_STATUS_H_
 
 #include <string>
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebCrypto.h"
@@ skipping 132 matching lines @@
 
   // The data provided to an encrypt/decrypt/sign/verify operation was too
   // small. This usually represents an algorithm restriction (for instance
   // AES-KW requires a minimum of 24 bytes input data).
   static Status ErrorDataTooSmall();
 
   // Something was unsupported or unimplemented. This can mean the algorithm in
   // question was unsupported, some parameter combination was unsupported, or
   // something has not yet been implemented.
   static Status ErrorUnsupported();
+  static Status ErrorUnsupported(const std::string message);
 
   // Something unexpected happened in the code, which implies there is a
   // source-level bug. These should not happen, but safer to fail than simply
   // DCHECK.
   static Status ErrorUnexpected();
 
   // The authentication tag length specified for AES-GCM encrypt/decrypt was
   // not 32, 64, 96, 104, 112, 120, or 128.
   static Status ErrorInvalidAesGcmTagLength();
 
@@ skipping 39 matching lines @@
   Type type_;
   blink::WebCryptoErrorType error_type_;
   std::string error_details_;
 };
 
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_STATUS_H_