Cleanup: Remove unneeded forward declarations in chrome/installer.

chrome/installer/util/installation_state.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_INSTALLER_UTIL_INSTALLATION_STATE_H_
 #define CHROME_INSTALLER_UTIL_INSTALLATION_STATE_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/installer/util/app_commands.h"
 #include "chrome/installer/util/browser_distribution.h"
 #include "chrome/installer/util/channel_info.h"
 
 class Version;
 
 namespace base {
 namespace win {
 class RegKey;
 }
 }
 
 namespace installer {
 
 class InstallationState;
-class MasterPreferences;
 
 // A representation of a product's state on the machine based on the contents
 // of the Windows registry.
 // TODO(grt): Pull this out into its own file.
 class ProductState {
  public:
   ProductState();
 
   // Returns true if the product is installed (i.e., the product's Clients key
   // exists and has a "pv" value); false otherwise.
@@ skipping 122 matching lines @@
   ProductState user_products_[NUM_PRODUCTS];
   ProductState system_products_[NUM_PRODUCTS];
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstallationState);
 };  // class InstallationState
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_INSTALLATION_STATE_H_