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

components/drive/file_system_observer.h

 // Copyright (c) 2012 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_FILE_SYSTEM_OBSERVER_H_
-#define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_OBSERVER_H_
+#ifndef COMPONENTS_DRIVE_FILE_SYSTEM_OBSERVER_H_
+#define COMPONENTS_DRIVE_FILE_SYSTEM_OBSERVER_H_
 
 #include "components/drive/file_errors.h"
 #include "components/drive/file_system/operation_delegate.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace drive {
 
@@ skipping 14 matching lines @@
   // |type| is a type of the error. |file_name| is a virtual path of the entry.
   virtual void OnDriveSyncError(file_system::DriveSyncErrorType type,
                                 const base::FilePath& file_path) {}
 
  protected:
   virtual ~FileSystemObserver() {}
 };
 
 }  // namespace drive
 
-#endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_OBSERVER_H_
+#endif  // COMPONENTS_DRIVE_FILE_SYSTEM_OBSERVER_H_