[webcrypto] Replace KeyAlgorithm interfaces with an Object.

public/platform/WebCryptoKeyAlgorithm.h

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 67 matching lines @@
 
     BLINK_PLATFORM_EXPORT WebCryptoKeyAlgorithmParamsType paramsType() const;
 
     // Returns the type-specific parameters for this key. If the requested
     // parameters are not applicable (for instance an HMAC key does not have
     // any AES parameters) then returns 0.
     BLINK_PLATFORM_EXPORT WebCryptoAesKeyAlgorithmParams* aesParams() const;
     BLINK_PLATFORM_EXPORT WebCryptoHmacKeyAlgorithmParams* hmacParams() const;
     BLINK_PLATFORM_EXPORT WebCryptoRsaHashedKeyAlgorithmParams* rsaHashedParams() const;
 
+    // Write the algorithm parameters to a dictionary.
+    BLINK_PLATFORM_EXPORT void writeToDictionary(WebCryptoKeyAlgorithmDictionary*) const;
+
 private:
     BLINK_PLATFORM_EXPORT void assign(const WebCryptoKeyAlgorithm& other);
     BLINK_PLATFORM_EXPORT void reset();
 
     WebPrivatePtr<WebCryptoKeyAlgorithmPrivate> m_private;
 };
 
 } // namespace blink
 
 #endif