chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/extensions/file_manager/private_api_mount.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.
 //
 // This file provides task related API functions.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MOUNT_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MOUNT_H_
 
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "chrome/browser/chromeos/extensions/file_manager/private_api_base.h"
 #include "components/drive/drive.pb.h"
 #include "components/drive/file_errors.h"
 
-namespace ui {
-struct SelectedFileInfo;
-}
-
 namespace extensions {
 
 // Implements chrome.fileManagerPrivate.addMount method.
 // Mounts removable devices and archive files.
 class FileManagerPrivateAddMountFunction : public LoggedAsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileManagerPrivate.addMount",
                              FILEMANAGERPRIVATE_ADDMOUNT)
 
  protected:
@@ skipping 41 matching lines @@
  protected:
   ~FileManagerPrivateGetVolumeMetadataListFunction() override {}
 
   // AsyncExtensionFunction overrides.
   bool RunAsync() override;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MOUNT_H_