components: Cleanup class/struct fwd declarations

components/sync/engine_impl/model_type_registry.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 COMPONENTS_SYNC_ENGINE_IMPL_MODEL_TYPE_REGISTRY_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_MODEL_TYPE_REGISTRY_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 10 matching lines @@
 #include "components/sync/engine_impl/nudge_handler.h"
 #include "components/sync/engine_impl/uss_migrator.h"
 #include "components/sync/syncable/user_share.h"
 
 namespace syncer {
 
 class CommitContributor;
 class DataTypeDebugInfoEmitter;
 class DirectoryCommitContributor;
 class DirectoryUpdateHandler;
-class ModelTypeProcessor;
 class ModelTypeWorker;
 class UpdateHandler;
-struct ModelTypeState;
 
 typedef std::map<ModelType, UpdateHandler*> UpdateHandlerMap;
 typedef std::map<ModelType, CommitContributor*> CommitContributorMap;
 
 // Keeps track of the sets of active update handlers and commit contributors.
 class ModelTypeRegistry : public ModelTypeConnector,
                           public SyncEncryptionHandler::Observer {
  public:
   // Constructs a ModelTypeRegistry that supports directory types.
   ModelTypeRegistry(const std::vector<scoped_refptr<ModelSafeWorker>>& workers,
@@ skipping 118 matching lines @@
   base::ObserverList<TypeDebugInfoObserver> type_debug_info_observers_;
 
   base::WeakPtrFactory<ModelTypeRegistry> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ModelTypeRegistry);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_IMPL_MODEL_TYPE_REGISTRY_H_