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

chrome/browser/chromeos/user_cros_settings_provider.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_USER_CROS_SETTINGS_PROVIDER_H_
 #define CHROME_BROWSER_CHROMEOS_USER_CROS_SETTINGS_PROVIDER_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "chrome/browser/chromeos/cros_settings_provider.h"
 #include "chrome/browser/chromeos/login/signed_settings_helper.h"
 
 class PrefService;
-class Task;
 
 namespace base {
 class ListValue;
 }
 
 namespace chromeos {
 
 // CrosSettingsProvider implementation that works with SignedSettings.
 // TODO(nkostylev): Rename this class to indicate that it is
 // SignedSettings specific.
@@ skipping 48 matching lines @@
  private:
   // CrosSettingsProvider implementation.
   virtual void DoSet(const std::string& path, base::Value* value) OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(UserCrosSettingsProvider);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_USER_CROS_SETTINGS_PROVIDER_H_