Separate ash::test::DisplayManagerTestApi from ash

ash/utility/screenshot_controller_unittest.cc

Index: ash/utility/screenshot_controller_unittest.cc
diff --git a/ash/utility/screenshot_controller_unittest.cc b/ash/utility/screenshot_controller_unittest.cc
index b7e9ddac3701ba8fd53a705bee76d3cc3b7e7b95..88dbffd0089ff8cdb53138b085703160624bba3b 100644
--- a/ash/utility/screenshot_controller_unittest.cc
+++ b/ash/utility/screenshot_controller_unittest.cc
@@ -33,8 +33,8 @@ class ScreenshotControllerTest : public test::AshTestBase {
   }
 
   bool TestIfMouseWarpsAt(const gfx::Point& point_in_screen) {
-    return test::DisplayManagerTestApi::TestIfMouseWarpsAt(GetEventGenerator(),
-                                                           point_in_screen);
+    return test::AshTestBase::TestIfMouseWarpsAt(GetEventGenerator(),
+                                                 point_in_screen);
   }
 
   void StartPartialScreenshotSession() {