Cleanup: Remove unneeded forward declarations in chrome/installer.

chrome/installer/setup/uninstall.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 declares Chrome uninstall related functions.
 
 #ifndef CHROME_INSTALLER_SETUP_UNINSTALL_H_
 #define CHROME_INSTALLER_SETUP_UNINSTALL_H_
 #pragma once
 
 #include <shlobj.h>
 
 #include <string>
 
 #include "chrome/installer/util/util_constants.h"
 
 class BrowserDistribution;
 class CommandLine;
 class FilePath;
-class InstallUtil;
 
 namespace installer {
 
 class InstallationState;
 class InstallerState;
 class Product;
 
 // This function removes all Chrome registration related keys. It returns true
 // if successful, otherwise false. The error code is set in |exit_code|.
 // |root| is the registry root (HKLM|HKCU) and |browser_entry_suffix| is the
@@ skipping 26 matching lines @@
     const InstallerState& installer_state,
     const FilePath& setup_path,
     const Product& dist,
     bool remove_all,
     bool force_uninstall,
     const CommandLine& cmd_line);
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_SETUP_UNINSTALL_H_