[Sync] Move ModelTypeProcessor* and rename *Impl to Shared*.

sync/internal_api/public/model_type_processor.h

Index: sync/internal_api/public/model_type_processor.h
diff --git a/sync/engine/model_type_processor.h b/sync/internal_api/public/model_type_processor.h
similarity index 85%
rename from sync/engine/model_type_processor.h
rename to sync/internal_api/public/model_type_processor.h
index 0cb8581177f1c8ae0f7690902f5778bbacc4deb8..0f1971ef3714039678e62bdf5e7337719a279218 100644
--- a/sync/engine/model_type_processor.h
+++ b/sync/internal_api/public/model_type_processor.h
@@ -2,15 +2,15 @@
 // 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_PROCESSOR_H_
-#define SYNC_ENGINE_MODEL_TYPE_PROCESSOR_H_
+#ifndef SYNC_INTERNAL_API_PUBLIC_MODEL_TYPE_PROCESSOR_H_
+#define SYNC_INTERNAL_API_PUBLIC_MODEL_TYPE_PROCESSOR_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "sync/base/sync_export.h"
-#include "sync/engine/commit_queue.h"
 #include "sync/internal_api/public/non_blocking_sync_common.h"
 
 namespace syncer_v2 {
+class CommitQueue;
 
 // Interface used by sync backend to issue requests to a synced data type.
 class SYNC_EXPORT_PRIVATE ModelTypeProcessor {
@@ -37,4 +37,4 @@ class SYNC_EXPORT_PRIVATE ModelTypeProcessor {
 
 }  // namespace syncer
 
-#endif  // SYNC_ENGINE_MODEL_TYPE_PROCESSOR_H_
+#endif  // SYNC_INTERNAL_API_PUBLIC_MODEL_TYPE_PROCESSOR_H_