Re-apply r23841 "During uninstall if Chrome is set as default"

chrome/installer/util/shell_util.h

 // Copyright (c) 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 methods that are useful for integrating Chrome in
 // Windows shell. These methods are all static and currently part of
 // ShellUtil class.
 
 #ifndef CHROME_INSTALLER_UTIL_SHELL_UTIL_H_
 #define CHROME_INSTALLER_UTIL_SHELL_UTIL_H_
 
 #include <windows.h>
+#include <map>
 #include <string>
 
 #include "base/basictypes.h"
 #include "chrome/installer/util/work_item_list.h"
 
 // This is a utility class that provides common shell integration methods
 // that can be used by installer as well as Chrome.
 class ShellUtil {
  public:
   // Input to any methods that make changes to OS shell.
@@ skipping 109 matching lines @@
   // otherwise returns false.
   static bool GetDesktopPath(bool system_level, std::wstring* path);
 
   // Gets the Quick Launch shortcuts path for the current user and
   // returns it in 'path' argument. Return true if successful, otherwise
   // returns false. If system_level is true this function returns the path
   // to Default Users Quick Launch shortcuts path. Adding a shortcut to Default
   // User's profile only affects any new user profiles (not existing ones).
   static bool GetQuickLaunchPath(bool system_level, std::wstring* path);
 
+  // Gets a mapping of all registered browser (on local machine) names and
+  // thier reinstall command (which usually sets browser as default).
+  static void GetRegisteredBrowsers(std::map<std::wstring,
+                                    std::wstring>* browsers);
+
   // This function gets a suffix (user's login name) that can be added
   // to Chromium default browser entry in the registry to create a unique name
   // if there are multiple users on the machine, each with their own copy of
   // Chromium that they want to set as default browser.
   // This suffix value is assigned to |entry|. The function also checks for
   // existence of Default Browser registry key with this suffix and
   // returns true if it exists. In all other cases it returns false.
   static bool GetUserSpecificDefaultBrowserSuffix(std::wstring* entry);
 
   // Make Chrome default browser.
@@ skipping 57 matching lines @@
                                    const std::wstring& shortcut,
                                    const std::wstring& description,
                                    bool create_new);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShellUtil);
 };
 
 
 #endif  // CHROME_INSTALLER_UTIL_SHELL_UTIL_H_