Fix some problems with machine level install.

chrome/installer/util/browser_distribution.h

 // Copyright (c) 2006-2008 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_
 
 #include "base/basictypes.h"
 #include "chrome/installer/util/util_constants.h"
 #include "chrome/installer/util/version.h"
 
 class BrowserDistribution {
  public:
   virtual ~BrowserDistribution() {}
 
   static BrowserDistribution* GetDistribution();
 
   virtual void DoPostUninstallOperations(const installer::Version& version);
 
-  virtual void DoPreUninstallOperations();
-
   virtual std::wstring GetApplicationName();
 
   virtual std::wstring GetInstallSubDir();
 
   virtual std::wstring GetPublisherName();
 
   virtual int GetInstallReturnCode(
       installer_util::InstallStatus install_status);
 
   virtual std::wstring GetUninstallLinkName();
 
   virtual std::wstring GetUninstallRegPath();
 
   virtual std::wstring GetVersionKey();
 
   virtual void UpdateDiffInstallStatus(bool system_install,
       bool incremental_install, installer_util::InstallStatus install_status);
 
  protected:
   BrowserDistribution() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserDistribution);
 };
 
 #endif  // CHROME_INSTALLER_UTIL_BROWSER_DISTRIBUTION_H_