components: Cleanup class/struct fwd declarations

components/sync/base/cryptographer.h

 // Copyright 2012 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_SYNC_BASE_CRYPTOGRAPHER_H_
 #define COMPONENTS_SYNC_BASE_CRYPTOGRAPHER_H_
 
 #include <map>
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "components/sync/base/nigori.h"
 #include "components/sync/protocol/encryption.pb.h"
 
 namespace sync_pb {
 class NigoriKeyBag;
-class NigoriSpecifics;
 }
 
 namespace syncer {
 
 class Encryptor;
 
 extern const char kNigoriTag[];
 
 // The parameters used to initialize a Nigori instance.
 struct KeyParams {
@@ skipping 180 matching lines @@
   std::string default_nigori_name_;
 
   std::unique_ptr<sync_pb::EncryptedData> pending_keys_;
 
   DISALLOW_ASSIGN(Cryptographer);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_BASE_CRYPTOGRAPHER_H_