Cleanup: Remove unneeded forward declarations in chrome/installer.

chrome/installer/util/browser_distribution.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 a class that contains various method related to branding.
 
 #ifndef CHROME_INSTALLER_UTIL_BROWSER_DISTRIBUTION_H_
 #define CHROME_INSTALLER_UTIL_BROWSER_DISTRIBUTION_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/version.h"
 #include "chrome/installer/util/util_constants.h"
 
 #if defined(OS_WIN)
 #include <windows.h>  // NOLINT
 #endif
 
-class CommandLine;
-
 namespace installer {
-class ChannelInfo;
-class MasterPreferences;
 class Product;
 }
 
 class BrowserDistribution {
  public:
   enum Type {
     CHROME_BROWSER,
     CHROME_FRAME,
     CHROME_BINARIES,
     NUM_TYPES
@@ skipping 112 matching lines @@
 
   const Type type_;
 
  private:
   BrowserDistribution();
 
   DISALLOW_COPY_AND_ASSIGN(BrowserDistribution);
 };
 
 #endif  // CHROME_INSTALLER_UTIL_BROWSER_DISTRIBUTION_H_