chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/extensions/file_manager/private_api_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.
 //
 // This file provides file system related API functions.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_FILE_SYSTEM_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
 
 #include "base/macros.h"
 #include "chrome/browser/chromeos/extensions/file_manager/private_api_base.h"
 #include "chrome/browser/extensions/chrome_extension_function.h"
 #include "chrome/browser/extensions/chrome_extension_function_details.h"
 #include "components/drive/file_errors.h"
 #include "device/media_transfer_protocol/mtp_storage_info.pb.h"
 #include "extensions/browser/extension_function.h"
 #include "storage/browser/fileapi/file_system_url.h"
 
-class GURL;
-
-namespace base {
-class FilePath;
-}  // namespace base
-
 namespace storage {
 class FileSystemContext;
 class FileSystemURL;
 }  // namespace storage
 
 namespace file_manager {
 namespace util {
 struct EntryDefinition;
 typedef std::vector<EntryDefinition> EntryDefinitionList;
 }  // namespace util
@@ skipping 308 matching lines @@
 
   void OnDirectorySizeRetrieved(int64_t size);
 
   // AsyncExtensionFunction overrides
   bool RunAsync() override;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_FILE_SYSTEM_H_