[Sync] Move SharedModelTypeProcessor to model_impl/.

components/sync/model/model_type_change_processor.cc

Index: components/sync/model/model_type_change_processor.cc
diff --git a/components/sync/model/model_type_change_processor.cc b/components/sync/model/model_type_change_processor.cc
index f05733c31ad41711ecb1e160601e04fa6dc19276..3eb978aaa255a8cf8c9fbf582b109f45064208cd 100644
--- a/components/sync/model/model_type_change_processor.cc
+++ b/components/sync/model/model_type_change_processor.cc
@@ -4,10 +4,19 @@
 
 #include "components/sync/model/model_type_change_processor.h"
 
+#include "base/memory/ptr_util.h"
+#include "components/sync/model_impl/shared_model_type_processor.h"
+
 namespace syncer {
 
-ModelTypeChangeProcessor::ModelTypeChangeProcessor() {}
+// static
+std::unique_ptr<ModelTypeChangeProcessor> ModelTypeChangeProcessor::Create(
+    ModelType type,
+    ModelTypeService* service) {
+  return base::MakeUnique<SharedModelTypeProcessor>(type, service);
+}
 
+ModelTypeChangeProcessor::ModelTypeChangeProcessor() {}
 ModelTypeChangeProcessor::~ModelTypeChangeProcessor() {}
 
 }  // namespace syncer