Move the 'Exit session' button to the most left side in the system tray.

ash/common/system/status_area_widget.cc

Index: ash/common/system/status_area_widget.cc
diff --git a/ash/common/system/status_area_widget.cc b/ash/common/system/status_area_widget.cc
index cdc92b54f5e824d6b45bb1ebbf5384e257fb5eda..06bdf90c0d2c21eceda997e746f013cf09ae213d 100644
--- a/ash/common/system/status_area_widget.cc
+++ b/ash/common/system/status_area_widget.cc
@@ -64,10 +64,10 @@ void StatusAreaWidget::CreateTrayViews() {
   AddSystemTray();
   AddWebNotificationTray();
 #if defined(OS_CHROMEOS)
-  AddLogoutButtonTray();
   AddPaletteTray();
   AddVirtualKeyboardTray();
   AddImeMenuTray();
+  AddLogoutButtonTray();
 #endif
 
   SystemTrayDelegate* delegate = WmShell::Get()->system_tray_delegate();