Revert "Move a bunch of ChromeOS APIs out of chrome/browser/extensions."

chrome/browser/extensions/file_manager_util.h

 // Copyright (c) 2011 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_EXTENSIONS_FILE_MANAGER_UTIL_H_
-#define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_UTIL_H_
+#ifndef CHROME_BROWSER_EXTENSIONS_FILE_MANAGER_UTIL_H_
+#define CHROME_BROWSER_EXTENSIONS_FILE_MANAGER_UTIL_H_
 #pragma once
 
 #include <string>
 
 #include "base/file_path.h"
 #include "chrome/browser/ui/select_file_dialog.h"
 #include "googleurl/src/gurl.h"
 
 class Profile;
 
@@ skipping 29 matching lines @@
     const FilePath::StringType& default_extension);
 
 // Opens file browser UI in its own tab on file system location defined with
 // |dir|.
 void ViewFolder(const FilePath& dir);
 
 void ViewItem(const FilePath& full_path, bool enqueue);
 
 }  // namespace file_manager_util
 
-#endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_UTIL_H_
+#endif  // CHROME_BROWSER_EXTENSIONS_FILE_MANAGER_UTIL_H_