remoting: Cleanup class/struct fwd declarations

remoting/host/token_validator_factory_impl.h

 // 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.
 
 #ifndef REMOTING_HOST_TOKEN_VALIDATOR_FACTORY_IMPL_H_
 #define REMOTING_HOST_TOKEN_VALIDATOR_FACTORY_IMPL_H_
 
 #include <set>
 #include <string>
 
 #include "base/macros.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "remoting/host/token_validator_base.h"
 #include "remoting/protocol/token_validator.h"
 
 namespace remoting {
 
+class RsaKeyPair;
+
 // This class dispenses |TokenValidator| implementations that use a UrlFetcher
 // to contact a |token_validation_url| and exchange the |token| for a
 // |shared_secret|.
 class TokenValidatorFactoryImpl : public protocol::TokenValidatorFactory {
  public:
   // Creates a new factory. |token_url| and |token_validation_url| are the
   // third party authentication service URLs, obtained via policy. |key_pair_|
   // is used by the host to authenticate with the service by signing the token.
   TokenValidatorFactoryImpl(
       const ThirdPartyAuthConfig& third_party_auth_config,
@@ skipping 11 matching lines @@
   ThirdPartyAuthConfig third_party_auth_config_;
   scoped_refptr<RsaKeyPair> key_pair_;
   scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
 
   DISALLOW_COPY_AND_ASSIGN(TokenValidatorFactoryImpl);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_URL_FETCHER_TOKEN_VALIDATOR_FACTORY_H_