Move chrome/browser/chromeos/drive/file_system.cc (+deps) into components/drive.

components/drive/dummy_file_system.h

 // Copyright 2013 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.
 
-#ifndef CHROME_BROWSER_CHROMEOS_DRIVE_DUMMY_FILE_SYSTEM_H_
-#define CHROME_BROWSER_CHROMEOS_DRIVE_DUMMY_FILE_SYSTEM_H_
+#ifndef COMPONENTS_DRIVE_DUMMY_FILE_SYSTEM_H_
+#define COMPONENTS_DRIVE_DUMMY_FILE_SYSTEM_H_
 
 #include "components/drive/file_system_interface.h"
 
 namespace drive {
 
 // Dummy implementation of FileSystemInterface. All functions do nothing.
 class DummyFileSystem : public FileSystemInterface {
  public:
   ~DummyFileSystem() override {}
   void AddObserver(FileSystemObserver* observer) override {}
@@ skipping 84 matching lines @@
                              const GetFilePathCallback& callback) override {}
   void FreeDiskSpaceIfNeededFor(
       int64 num_bytes,
       const FreeDiskSpaceCallback& callback) override {}
   void CalculateEvictableCacheSize(
       const EvictableCacheSizeCallback& callback) override {}
 };
 
 }  // namespace drive
 
-#endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DUMMY_FILE_SYSTEM_H_
+#endif  // COMPONENTS_DRIVE_DUMMY_FILE_SYSTEM_H_