Remove stale code to delete the metro user data dir. It never shipped.

chrome/installer/util/helper.h

 // 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;
 
 namespace base {
 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...)
 base::FilePath GetChromeInstallPath(bool system_install, 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<base::FilePath>* paths);
+// Returns the path to the directory that holds the user data.  This is always
+// inside a user's local application data folder (e.g., "AppData\Local" or
+// "Local Settings\Application Data" in %USERPROFILE%). 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.
+base::FilePath GetChromeUserDataPath(BrowserDistribution* dist);
 
 // 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_