Remove unnecessary files

cpp/src/arrow/flight/middleware.cc

@@ -1,36 +0,0 @@
-// Licensed to the Apache Software Foundation (ASF) under one
-// or more contributor license agreements.  See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership.  The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License.  You may obtain a copy of the License at
-//
-//   http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing,
-// software distributed under the License is distributed on an
-// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-// KIND, either express or implied.  See the License for the
-// specific language governing permissions and limitations
-// under the License.
-
-// Platform-specific defines
-#include "arrow/flight/platform.h"
-
-#include "arrow/flight/middleware.h"
-
-#include <map>
-
-#ifdef GRPCPP_PP_INCLUDE
-#include <grpcpp/grpcpp.h>
-#else
-#include <grpc++/grpc++.h>
-#endif
-
-#include "arrow/util/logging.h"
-#include "arrow/util/stl.h"
-
-namespace arrow {
-namespace flight {}  // namespace flight
-}  // namespace arrow

cpp/src/arrow/flight/middleware_internal.cc

@@ -1,35 +0,0 @@
-// Licensed to the Apache Software Foundation (ASF) under one
-// or more contributor license agreements.  See the NOTICE file
-// distributed with this work for additional information
-// regarding copyright ownership.  The ASF licenses this file
-// to you under the Apache License, Version 2.0 (the
-// "License"); you may not use this file except in compliance
-// with the License.  You may obtain a copy of the License at
-//
-//   http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing,
-// software distributed under the License is distributed on an
-// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-// KIND, either express or implied.  See the License for the
-// specific language governing permissions and limitations
-// under the License.
-
-// Platform-specific defines
-#include "arrow/flight/platform.h"
-
-#include "arrow/flight/middleware_internal.h"
-
-#include <map>
-#include <memory>
-#include <string>
-#include <utility>
-
-#include "arrow/util/stl.h"
-
-namespace arrow {
-namespace flight {
-
-namespace internal {}  // namespace internal
-}  // namespace flight
-}  // namespace arrow