[M58] exo: Confine windows to primary display

components/exo/wm_helper_ash.cc

Index: components/exo/wm_helper_ash.cc
diff --git a/components/exo/wm_helper_ash.cc b/components/exo/wm_helper_ash.cc
index 413eeb8e6a60302aea0b24eba02c7a5bdcc878e1..e1c7845445411aed18c32ba1d5fe956a57baca46 100644
--- a/components/exo/wm_helper_ash.cc
+++ b/components/exo/wm_helper_ash.cc
@@ -53,7 +53,7 @@ const display::ManagedDisplayInfo WMHelperAsh::GetDisplayInfo(
 }
 
 aura::Window* WMHelperAsh::GetContainer(int container_id) {
-  return ash::Shell::GetContainer(ash::Shell::GetTargetRootWindow(),
+  return ash::Shell::GetContainer(ash::Shell::GetPrimaryRootWindow(),
                                   container_id);
 }