chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/file_system_provider/throttled_file_system.h

 // Copyright 2015 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_FILE_SYSTEM_PROVIDER_THROTTLED_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_THROTTLED_FILE_SYSTEM_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/chromeos/file_system_provider/abort_callback.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_observer.h"
 #include "storage/browser/fileapi/async_file_util.h"
 #include "storage/browser/fileapi/watcher_manager.h"
 #include "url/gurl.h"
 
-class Profile;
-
 namespace net {
 class IOBuffer;
 }  // namespace net
 
 namespace base {
 class FilePath;
 }  // namespace base
 
 namespace chromeos {
 namespace file_system_provider {
@@ skipping 115 matching lines @@
   std::map<int, int> opened_files_;
 
   base::WeakPtrFactory<ThrottledFileSystem> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(ThrottledFileSystem);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_THROTTLED_FILE_SYSTEM_H_