Use a better registration suffix that will always be unique while respecting the MSDN rules.

chrome/installer/util/shell_util.h

Index: chrome/installer/util/shell_util.h
diff --git a/chrome/installer/util/shell_util.h b/chrome/installer/util/shell_util.h
index a29caddafe4100c985a69cc7e77c860aa858d52c..1020d98a07943096a624e20437ba44a58756a85d 100644
--- a/chrome/installer/util/shell_util.h
+++ b/chrome/installer/util/shell_util.h
@@ -243,8 +243,8 @@ class ShellUtil {
                                      const string16& chrome_exe);
 
   // Returns the AppUserModelId for |dist|. This identifier is unconditionally
-  // suffixed with the user id for user-level installs (in contrast to other
-  // registration entries which are suffix as described in
+  // suffixed with a unique id for this user on user-level installs (in contrast
+  // to other registration entries which are suffixed as described in
   // GetCurrentInstallationSuffix() above).
   static string16 GetBrowserModelId(BrowserDistribution* dist,
                                     const string16& chrome_exe);