components: Cleanup class/struct fwd declarations

components/cryptauth/cryptauth_enroller_impl.h

 // Copyright 2015 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 COMPONENTS_PROXIMITY_AUTH_CRYPTAUTH_ENROLLER_IMPL_H
 #define COMPONENTS_PROXIMITY_AUTH_CRYPTAUTH_ENROLLER_IMPL_H
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/cryptauth/cryptauth_enroller.h"
 #include "components/cryptauth/proto/cryptauth_api.pb.h"
 
 namespace cryptauth {
 
 class CryptAuthClient;
 class CryptAuthClientFactory;
-class CryptAuthClientFactoryImpl;
 class SecureMessageDelegate;
 
 // Implementation of CryptAuthEnroller to perform enrollment in two steps:
 // 1. SetupEnrollment:
 //     Obtain a session public key from CryptAuth used to encrypt enrollment
 //     data. Generate an ephemeral public key and derive a session symmetric
 //     key.
 // 2. FinishEnrollment:
 //     Encrypt the enrollment data with the session symmetric key, and send the
 //     payload and device's public key to CryptAuth.
@@ skipping 64 matching lines @@
   std::string symmetric_key_;
 
   base::WeakPtrFactory<CryptAuthEnrollerImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CryptAuthEnrollerImpl);
 };
 
 }  // namespace cryptauth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_CRYPTAUTH_ENROLLER_IMPL_H