Clean up ARC file system unit tests.

components/arc/file_system/arc_file_system_operation_runner.cc

Index: components/arc/file_system/arc_file_system_operation_runner.cc
diff --git a/components/arc/file_system/arc_file_system_operation_runner.cc b/components/arc/file_system/arc_file_system_operation_runner.cc
deleted file mode 100644
index ac9662effcb7176664846aea2ee0eba2abecee4d..0000000000000000000000000000000000000000
--- a/components/arc/file_system/arc_file_system_operation_runner.cc
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2017 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.
-
-#include "components/arc/file_system/arc_file_system_operation_runner.h"
-
-namespace arc {
-
-// static
-const char ArcFileSystemOperationRunner::kArcServiceName[] =
-    "arc::ArcFileSystemOperationRunner";
-
-ArcFileSystemOperationRunner::ArcFileSystemOperationRunner(
-    ArcBridgeService* bridge_service)
-    : ArcService(bridge_service) {}
-
-ArcFileSystemOperationRunner::~ArcFileSystemOperationRunner() = default;
-
-}  // namespace arc