Separate ash::test::DisplayManagerTestApi from ash

ash/wm/drag_window_resizer_unittest.cc

Index: ash/wm/drag_window_resizer_unittest.cc
diff --git a/ash/wm/drag_window_resizer_unittest.cc b/ash/wm/drag_window_resizer_unittest.cc
index f69b0902161c757badf0c03222b9bffae3430291..56ed6a363e8ee7f0940bc21451c0d73324f09f86 100644
--- a/ash/wm/drag_window_resizer_unittest.cc
+++ b/ash/wm/drag_window_resizer_unittest.cc
@@ -152,8 +152,8 @@ class DragWindowResizerTest : public test::AshMDTestBase {
   }
 
   bool TestIfMouseWarpsAt(const gfx::Point& point_in_screen) {
-    return test::DisplayManagerTestApi::TestIfMouseWarpsAt(GetEventGenerator(),
-                                                           point_in_screen);
+    return test::AshTestBase::TestIfMouseWarpsAt(GetEventGenerator(),
+                                                 point_in_screen);
   }
 
   aura::test::TestWindowDelegate delegate_;