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 3298f05602fceab57d553833909fe8408ee21718..3bac9729f9a7bd4744cbffcd94b28a137472dca7 100644
--- a/ash/wm/dock/docked_window_layout_manager.cc
+++ b/ash/wm/dock/docked_window_layout_manager.cc
@@ -36,6 +36,7 @@
 #include "ui/gfx/image/image_skia_operations.h"
 #include "ui/gfx/rect.h"
 #include "ui/views/background.h"
+#include "ui/views/corewm/transient_window_manager.h"
 
 namespace ash {
 namespace internal {
@@ -181,7 +182,7 @@ namespace {
 // Returns true if a window is a popup or a transient child.
 bool IsPopupOrTransient(const aura::Window* window) {
   return (window->type() == aura::client::WINDOW_TYPE_POPUP ||
-          window->transient_parent());
+          views::corewm::GetTransientParent(window));
 }
 
 // Certain windows (minimized, hidden or popups) do not matter to docking.