Moves management of transients out of Window

ash/wm/dock/docked_window_layout_manager.cc

Index: ash/wm/dock/docked_window_layout_manager.cc
diff --git a/ash/wm/dock/docked_window_layout_manager.cc b/ash/wm/dock/docked_window_layout_manager.cc
index 40088a42d81693cb5e683faaf2b56f7ffb1f3052..0a648a025f748303a10c7c27d0f6a78dfeedee28 100644
--- a/ash/wm/dock/docked_window_layout_manager.cc
+++ b/ash/wm/dock/docked_window_layout_manager.cc
@@ -37,6 +37,7 @@
 #include "ui/gfx/image/image_skia_operations.h"
 #include "ui/gfx/rect.h"
 #include "ui/views/background.h"
+#include "ui/views/corewm/window_util.h"
 
 namespace ash {
 namespace internal {
@@ -189,7 +190,7 @@ namespace {
 // Returns true if a window is a popup or a transient child.
 bool IsPopupOrTransient(const aura::Window* window) {
   return (window->type() == ui::wm::WINDOW_TYPE_POPUP ||
-          window->transient_parent());
+          views::corewm::GetTransientParent(window));
 }
 
 // Certain windows (minimized, hidden or popups) do not matter to docking.