remoting: Cleanup class/struct fwd declarations

remoting/protocol/token_validator.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 REMOTING_PROTOCOL_TOKEN_VALIDATOR_H_
 #define REMOTING_PROTOCOL_TOKEN_VALIDATOR_H_
 
 #include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "url/gurl.h"
 
 namespace remoting {
 
-class RsaKeyPair;
-
 namespace protocol {
 
 // The |TokenValidator| encapsulates the parameters to be sent to the client
 // to obtain a token, and the method to validate that token and obtain the
 // shared secret for the connection.
 class TokenValidator {
  public:
   // Callback passed to |ValidateThirdPartyToken|, and called once the host
   // authentication finishes. |shared_secret| should be used by the host to
   // create a V2Authenticator. In case of failure, the callback is called with
@@ skipping 32 matching lines @@
  protected:
   friend class base::RefCountedThreadSafe<TokenValidatorFactory>;
 
   virtual ~TokenValidatorFactory() {}
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_TOKEN_VALIDATOR_H_