Cleanup: Remove unneeded forward declarations in chrome/installer.

chrome/installer/setup/install_worker.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.
 //
 // This file contains the declarations of the installer functions that build
 // the WorkItemList used to install the application.
 
 #ifndef CHROME_INSTALLER_SETUP_INSTALL_WORKER_H_
 #define CHROME_INSTALLER_SETUP_INSTALL_WORKER_H_
 #pragma once
 
 #include <windows.h>
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 
 class BrowserDistribution;
 class CommandLine;
 class FilePath;
 class Version;
 class WorkItemList;
 
 namespace installer {
 
 class InstallationState;
 class InstallerState;
-class Package;
 class Product;
 
 // Helper function for AddGoogleUpdateWorkItems that mirrors oeminstall.
 void AddOemInstallWorkItems(const InstallationState& original_state,
                             const InstallerState& installer_state,
                             WorkItemList* install_list);
 
 // Helper function for AddGoogleUpdateWorkItems that mirrors eulaaccepted.
 void AddEulaAcceptedWorkItems(const InstallationState& original_state,
                               const InstallerState& installer_state,
@@ skipping 127 matching lines @@
 // (and may therefore be NULL) when uninstalling.
 void AddQuickEnableWorkItems(const InstallerState& installer_state,
                              const InstallationState& machine_state,
                              const FilePath* setup_path,
                              const Version* new_version,
                              WorkItemList* work_item_list);
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_SETUP_INSTALL_WORKER_H_