Fix some problems with machine level install.

chrome/installer/util/google_chrome_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 extends generic BrowserDistribution class to declare Google Chrome
 // specific implementation.
 
 #ifndef CHROME_INSTALLER_UTIL_GOOGLE_CHROME_DISTRIBUTION_H_
 #define CHROME_INSTALLER_UTIL_GOOGLE_CHROME_DISTRIBUTION_H_
 
 #include "chrome/installer/util/browser_distribution.h"
 #include "chrome/installer/util/util_constants.h"
 
 class GoogleChromeDistribution : public BrowserDistribution {
  public:
   virtual void DoPostUninstallOperations(const installer::Version& version);
 
-  virtual void DoPreUninstallOperations();
-
   virtual std::wstring GetApplicationName();
 
   virtual std::wstring GetInstallSubDir();
 
   // This method generates the new value for Google Update "ap" key for Chrome
   // based on whether we are doing incremental install (or not) and whether
   // the install succeeded.
   // - If install worked, remove the magic string (if present).
   // - If incremental installer failed, append a magic string (if
   //   not present already).
@@ skipping 21 matching lines @@
       bool incremental_install, installer_util::InstallStatus install_status);
 
  private:
   friend class BrowserDistribution;
 
   GoogleChromeDistribution() {}
 };
 
 #endif  // CHROME_INSTALLER_UTIL_GOOGLE_CHROME_DISTRIBUTION_H_