The "Update Chrome" menu item should appear in addition to the About menu.

app/menus/simple_menu_model.cc

Index: app/menus/simple_menu_model.cc
diff --git a/app/menus/simple_menu_model.cc b/app/menus/simple_menu_model.cc
index 6a40f755600fe45fb5c9011fafe14df3ae5603eb..b645b098305b6e3debbf74768b603f56693ba2b4 100644
--- a/app/menus/simple_menu_model.cc
+++ b/app/menus/simple_menu_model.cc
@@ -24,6 +24,10 @@ struct SimpleMenuModel::Item {
 ////////////////////////////////////////////////////////////////////////////////
 // SimpleMenuModel::Delegate, public:
 
+bool SimpleMenuModel::Delegate::IsCommandIdVisible(int command_id) const {
+  return true;
+}
+
 bool SimpleMenuModel::Delegate::IsLabelForCommandIdDynamic(
     int command_id) const {
   return false;
@@ -250,6 +254,14 @@ bool SimpleMenuModel::IsEnabledAt(int index) const {
   return delegate_->IsCommandIdEnabled(command_id);
 }
 
+bool SimpleMenuModel::IsVisibleAt(int index) const {
+  int command_id = GetCommandIdAt(index);
+  if (!delegate_ || command_id == kSeparatorId ||
+      items_.at(FlipIndex(index)).button_model)
+    return true;
+  return delegate_->IsCommandIdVisible(command_id);
+}
+
 void SimpleMenuModel::HighlightChangedTo(int index) {
   if (delegate_)
     delegate_->CommandIdHighlighted(GetCommandIdAt(index));
@@ -264,6 +276,10 @@ MenuModel* SimpleMenuModel::GetSubmenuModelAt(int index) const {
   return items_.at(FlipIndex(index)).submenu;
 }
 
+int SimpleMenuModel::FlipIndex(int index) const {
+  return index;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // SimpleMenuModel, Private: