[Sync] rename USS processor / worker interfaces

sync/engine/commit_queue.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 SYNC_ENGINE_MODEL_TYPE_SYNC_WORKER_H_
-#define SYNC_ENGINE_MODEL_TYPE_SYNC_WORKER_H_
+#ifndef SYNC_ENGINE_COMMIT_QUEUE_H_
+#define SYNC_ENGINE_COMMIT_QUEUE_H_
 
 #include "sync/internal_api/public/non_blocking_sync_common.h"
 
 namespace syncer_v2 {
 
 // Interface used by a synced data type to issue requests to the sync backend.
-class SYNC_EXPORT_PRIVATE ModelTypeSyncWorker {
+class SYNC_EXPORT_PRIVATE CommitQueue {
  public:
-  ModelTypeSyncWorker();
-  virtual ~ModelTypeSyncWorker();
+  CommitQueue();
+  virtual ~CommitQueue();
 
-  // Entry point for the ModelTypeSyncProxy to send commit requests.
+  // Entry point for the ModelTypeProcessor to send commit requests.
   virtual void EnqueueForCommit(const CommitRequestDataList& list) = 0;
 };
 
 }  // namespace syncer
 
-#endif  // SYNC_ENGINE_MODEL_TYPE_SYNC_WORKER_H_
+#endif  // SYNC_ENGINE_COMMIT_QUEUE_H_