Fix system-level detection in the mini_installer.

chrome/installer/mini_installer/configuration.h

Index: chrome/installer/mini_installer/configuration.h
diff --git a/chrome/installer/mini_installer/configuration.h b/chrome/installer/mini_installer/configuration.h
index 605fa907a2e8bc918d3e8be2c04c20c7758aaab6..db0cb2ed647c9a3c9b7c737e0d7d2406ccd061b5 100644
--- a/chrome/installer/mini_installer/configuration.h
+++ b/chrome/installer/mini_installer/configuration.h
@@ -53,7 +53,8 @@ class Configuration {
   // Returns true if --multi-install is on the command line.
   bool is_multi_install() const { return is_multi_install_; }
 
-  // Returns true if --system-level is on the command line.
+  // Returns true if --system-level is on the command line or if
+  // GoogleUpdateIsMachine=1 is set in the process's environment.
   bool is_system_level() const { return is_system_level_; }
 
   // Retuns true if --chrome-sxs is on the command line.