Relocate display_manager from ash to ui

ash/wm/dock/docked_window_layout_manager_unittest.cc

Index: ash/wm/dock/docked_window_layout_manager_unittest.cc
diff --git a/ash/wm/dock/docked_window_layout_manager_unittest.cc b/ash/wm/dock/docked_window_layout_manager_unittest.cc
index b204dd2bac4465f2ed6420c5932b7e826974e477..4b719d77bc53b7426b4faf3dfece32155d51208c 100644
--- a/ash/wm/dock/docked_window_layout_manager_unittest.cc
+++ b/ash/wm/dock/docked_window_layout_manager_unittest.cc
@@ -10,12 +10,10 @@
 #include "ash/common/wm/panels/panel_layout_manager.h"
 #include "ash/common/wm/window_resizer.h"
 #include "ash/common/wm/window_state.h"
-#include "ash/display/display_manager.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
-#include "ash/test/display_manager_test_api.h"
 #include "ash/test/shelf_view_test_api.h"
 #include "ash/test/shell_test_api.h"
 #include "ash/wm/window_state_aura.h"
@@ -27,7 +25,9 @@
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/hit_test.h"
 #include "ui/display/manager/display_layout.h"
+#include "ui/display/manager/display_manager.h"
 #include "ui/display/screen.h"
+#include "ui/display/test/display_manager_test_api.h"
 #include "ui/views/widget/widget.h"
 #include "ui/wm/core/coordinate_conversion.h"
 
@@ -502,8 +502,8 @@ TEST_P(DockedWindowLayoutManagerTest, ThreeWindowsDraggingSecondScreen) {
   // Layout the secondary display to the bottom of the primary.
   ASSERT_GT(display::Screen::GetScreen()->GetNumDisplays(), 1);
   Shell::GetInstance()->display_manager()->SetLayoutForCurrentDisplays(
-      test::CreateDisplayLayout(display_manager(),
-                                display::DisplayPlacement::BOTTOM, 0));
+      display::test::CreateDisplayLayout(display_manager(),
+                                         display::DisplayPlacement::BOTTOM, 0));
 
   std::unique_ptr<aura::Window> w1(
       CreateTestWindow(gfx::Rect(0, 1000, 201, 310)));