Clean up ARC file system unit tests.

components/arc/file_system/test/fake_arc_file_system_operation_runner.cc

Index: components/arc/file_system/test/fake_arc_file_system_operation_runner.cc
diff --git a/components/arc/file_system/test/fake_arc_file_system_operation_runner.cc b/components/arc/file_system/test/fake_arc_file_system_operation_runner.cc
deleted file mode 100644
index 7546b1bf5e987f971bd3fcc1b278bed712bf59b3..0000000000000000000000000000000000000000
--- a/components/arc/file_system/test/fake_arc_file_system_operation_runner.cc
+++ /dev/null
@@ -1,43 +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/test/fake_arc_file_system_operation_runner.h"
-
-#include "base/logging.h"
-
-namespace arc {
-
-FakeArcFileSystemOperationRunner::FakeArcFileSystemOperationRunner(
-    ArcBridgeService* bridge_service)
-    : ArcFileSystemOperationRunner(bridge_service) {}
-
-FakeArcFileSystemOperationRunner::~FakeArcFileSystemOperationRunner() = default;
-
-void FakeArcFileSystemOperationRunner::GetFileSize(
-    const GURL& url,
-    const GetFileSizeCallback& callback) {
-  NOTREACHED();
-}
-
-void FakeArcFileSystemOperationRunner::OpenFileToRead(
-    const GURL& url,
-    const OpenFileToReadCallback& callback) {
-  NOTREACHED();
-}
-
-void FakeArcFileSystemOperationRunner::GetDocument(
-    const std::string& authority,
-    const std::string& document_id,
-    const GetDocumentCallback& callback) {
-  NOTREACHED();
-}
-
-void FakeArcFileSystemOperationRunner::GetChildDocuments(
-    const std::string& authority,
-    const std::string& parent_document_id,
-    const GetChildDocumentsCallback& callback) {
-  NOTREACHED();
-}
-
-}  // namespace arc