Delete both regular and Metro user data dirs on uninstall.

chrome/installer/util/helper.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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 contains helper functions used by setup.
 
 #ifndef CHROME_INSTALLER_UTIL_HELPER_H_
 #define CHROME_INSTALLER_UTIL_HELPER_H_
 
 #include <string>
+#include <vector>
 
 class BrowserDistribution;
 class FilePath;
 
 namespace installer {
 
 // This function returns the install path for Chrome depending on whether its
 // system wide install or user specific install.
 // system_install: if true, the function returns system wide location
 //                 (ProgramFiles\Google). Otherwise it returns user specific
 //                 location (Document And Settings\<user>\Local Settings...)
 FilePath GetChromeInstallPath(bool system_install, BrowserDistribution* dist);
 
-// This function returns the path to the directory that holds the user data,
-// this is always inside "Document And Settings\<user>\Local Settings.". Note
-// that this is the default user data directory and does not take into account
-// that it can be overriden with a command line parameter.
-FilePath GetChromeUserDataPath(BrowserDistribution* dist);
+// Returns the path(s) to the directory that holds the user data (primary and,
+// if applicable to |dist|, alternate).  This is always inside a user's local
+// application data folder (e.g., "AppData\Local or "Local Settings\Application
+// Data" in %USERPROFILE%). Note that these are the defaults and do not take
+// into account that they can be overriden with a command line parameter.
+// |paths| may be empty on return, but is guaranteed not to contain empty paths
+// otherwise. If more than one path is returned, they are guaranteed to be
+// siblings.
+void GetChromeUserDataPaths(BrowserDistribution* dist,
+                            std::vector<FilePath>* paths);
 
 // Returns the distribution corresponding to the current process's binaries.
 // In the case of a multi-install product, this will be the CHROME_BINARIES
 // distribution.
 BrowserDistribution* GetBinariesDistribution(bool system_install);
 
 // Returns the app guid under which the current process receives updates from
 // Google Update.
 std::wstring GetAppGuidForUpdates(bool system_install);
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_UTIL_HELPER_H_