chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/extensions/file_manager/private_api_drive.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 Drive specific API functions.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_DRIVE_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_DRIVE_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/files/file.h"
 #include "chrome/browser/chromeos/extensions/file_manager/private_api_base.h"
 #include "chrome/browser/chromeos/file_manager/fileapi_util.h"
 #include "components/drive/chromeos/file_system_interface.h"
 #include "components/drive/file_errors.h"
 
 namespace drive {
-class FileCacheEntry;
 class ResourceEntry;
 struct SearchResultInfo;
 }
 
 namespace google_apis {
 class AuthService;
 }
 
 namespace extensions {
 
@@ skipping 224 matching lines @@
                       const std::string& access_token);
 
  private:
   GURL download_url_;
   std::unique_ptr<google_apis::AuthService> auth_service_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_DRIVE_H_