Separate ash::test::DisplayManagerTestApi from ash

ash/wm/maximize_mode/maximize_mode_controller_unittest.cc

Index: ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
diff --git a/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc b/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
index 181b59522512be66783386ad11f64f9115d28eff..3fa9369faca4ae8abb5038e9f51e59129cd1ec65 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
+++ b/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
@@ -82,7 +82,8 @@ class MaximizeModeControllerTest : public test::AshTestBase {
 
     // Set the first display to be the internal display for the accelerometer
     // screen rotation tests.
-    test::DisplayManagerTestApi().SetFirstDisplayAsInternalDisplay();
+    test::DisplayManagerTestApi(Shell::GetInstance()->display_manager())
+        .SetFirstDisplayAsInternalDisplay();
   }
 
   void TearDown() override {
@@ -489,7 +490,8 @@ TEST_F(MaximizeModeControllerTest, NoMaximizeModeWithDisabledInternalDisplay) {
   DisplayManager* display_manager = Shell::GetInstance()->display_manager();
   UpdateDisplay("200x200, 200x200");
   const int64_t internal_display_id =
-      test::DisplayManagerTestApi().SetFirstDisplayAsInternalDisplay();
+      test::DisplayManagerTestApi(Shell::GetInstance()->display_manager())
+          .SetFirstDisplayAsInternalDisplay();
   ASSERT_FALSE(IsMaximizeModeStarted());
 
   OpenLidToAngle(270.0f);