Cleanup: Remove unneeded forward declarations from chrome/browser/chromeos.

chrome/browser/chromeos/version_loader.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_VERSION_LOADER_H_
 #define CHROME_BROWSER_CHROMEOS_VERSION_LOADER_H_
 #pragma once
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "content/browser/cancelable_request.h"
 
-class FilePath;
-
 namespace chromeos {
 
 // ChromeOSVersionLoader loads the version of Chrome OS from the file system.
 // Loading is done asynchronously on the file thread. Once loaded,
 // ChromeOSVersionLoader callback to a method of your choice with the version
 // (or an empty string if the version couldn't be found).
 // To use ChromeOSVersionLoader do the following:
 //
 // . In your class define a member field of type chromeos::VersionLoader and
 //   CancelableRequestConsumerBase.
@@ skipping 80 matching lines @@
   static std::string ParseFirmware(const std::string& contents);
 
   scoped_refptr<Backend> backend_;
 
   DISALLOW_COPY_AND_ASSIGN(VersionLoader);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_VERSION_LOADER_H_