components: Cleanup class/struct fwd declarations

components/sync/engine_impl/commit_processor.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_COMMIT_PROCESSOR_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_COMMIT_PROCESSOR_H_
 
 #include <stddef.h>
 
 #include <map>
 #include <vector>
 
 #include "base/macros.h"
 #include "components/sync/base/model_type.h"
 #include "components/sync/engine/model_safe_worker.h"
 #include "components/sync/engine_impl/commit.h"
 #include "components/sync/engine_impl/model_type_registry.h"
 
 namespace syncer {
 
-namespace syncable {
-class Directory;
-}  // namespace syncable
-
 class CommitContributor;
-class CommitContribution;
 
 // This class manages the set of per-type committer objects.
 //
 // It owns these types and hides the details of iterating over all of them.
 // Many methods allow the caller to specify a subset of types on which the
 // operation is to be applied.  It is a logic error if the supplied set of types
 // contains a type which was not previously registered.
 class CommitProcessor {
  public:
   // Contructs a CommitProcessor from a map of CommitContributors.
@@ skipping 18 matching lines @@
  private:
   // A map of 'commit contributors', one for each enabled type.
   CommitContributorMap* commit_contributor_map_;
 
   DISALLOW_COPY_AND_ASSIGN(CommitProcessor);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_IMPL_COMMIT_PROCESSOR_H_