Remove multi-install from chrome/installer/setup.

chrome/installer/util/master_preferences.h

Index: chrome/installer/util/master_preferences.h
diff --git a/chrome/installer/util/master_preferences.h b/chrome/installer/util/master_preferences.h
index c2ffc62c9c8eb73f0b0b0026971e667586bb8ebd..9f1a569ac571cf2ddbcfc552b83711a345bbb70b 100644
--- a/chrome/installer/util/master_preferences.h
+++ b/chrome/installer/util/master_preferences.h
@@ -170,8 +170,6 @@ class MasterPreferences {
     return preferences_read_from_file_;
   }
 
-  bool install_chrome() const { return true; }
-
   bool is_multi_install() const { return false; }
 
   // Returns a reference to this MasterPreferences' root dictionary of values.