Implement installation of the Chrome App Host.

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 8baf9d6a9091054d2d18e1669b32270eb6c19936..e698d1dde283013e0fb4b2fc1a9d0eb026949a07 100644
--- a/chrome/installer/util/master_preferences.h
+++ b/chrome/installer/util/master_preferences.h
@@ -164,6 +164,10 @@ class MasterPreferences {
     return chrome_;
   }
 
+  bool install_chrome_app_host() const {
+    return chrome_app_host_;
+  }
+
   bool install_chrome_frame() const {
     return chrome_frame_;
   }
@@ -188,6 +192,7 @@ class MasterPreferences {
   base::DictionaryValue* distribution_;
   bool preferences_read_from_file_;
   bool chrome_;
+  bool chrome_app_host_;
   bool chrome_frame_;
   bool multi_install_;