Allow two user level installs of Chrome to have default browser settings.

chrome/installer/setup/uninstall.h

 // Copyright (c) 2006-2009 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__
+#ifndef CHROME_INSTALLER_SETUP_UNINSTALL_H_
+#define CHROME_INSTALLER_SETUP_UNINSTALL_H_
 
 #include <string>
 
 #include <shlobj.h>
 
 #include "base/command_line.h"
 #include "chrome/installer/util/util_constants.h"
 #include "chrome/installer/util/version.h"
 
 namespace installer_setup {
 // 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)
+// |root| is the registry root (HKLM|HKCU) and |browser_entry_suffix| is the
+// suffix for default browser entry name in the registry (optional).
 bool DeleteChromeRegistrationKeys(HKEY root,
+                                  const std::wstring& browser_entry_suffix,
                                   installer_util::InstallStatus& exit_code);
 
 // This function uninstalls Chrome.
 //
 // exe_path: Path to the executable (setup.exe) as it will be copied
 //           to temp folder before deleting Chrome folder.
 // system_uninstall: if true, the function uninstalls Chrome installed system
 //                   wise. otherwise, it uninstalls Chrome installed for the
 //                   current user.
 // remove_all: Remove all shared files, registry entries as well.
 // force_uninstall: Uninstall without prompting for user confirmation or
 //                  any checks for Chrome running.
 // cmd_line: CommandLine that contains information about the command that
 //           was used to launch current uninstaller.
 // cmd_params: Command line parameters passed to the uninstaller.
 installer_util::InstallStatus UninstallChrome(
     const std::wstring& exe_path, bool system_uninstall,
     bool remove_all, bool force_uninstall,
     const CommandLine& cmd_line, const wchar_t* cmd_params);
 
 }  // namespace installer_setup
 
-#endif  // CHROME_INSTALLER_SETUP_UNINSTALL_H__
+#endif  // CHROME_INSTALLER_SETUP_UNINSTALL_H_