Separate ash::test::DisplayManagerTestApi from ash

ash/sticky_keys/sticky_keys_overlay_unittest.cc

Index: ash/sticky_keys/sticky_keys_overlay_unittest.cc
diff --git a/ash/sticky_keys/sticky_keys_overlay_unittest.cc b/ash/sticky_keys/sticky_keys_overlay_unittest.cc
index ac67d4fca62c98ed2c9bdf24e277ec4d90a43f06..b2c76de5211a32c4a42190dc1bb49b55642a91f1 100644
--- a/ash/sticky_keys/sticky_keys_overlay_unittest.cc
+++ b/ash/sticky_keys/sticky_keys_overlay_unittest.cc
@@ -52,8 +52,8 @@ TEST_F(StickyKeysOverlayTest, OverlayNotDestroyedAfterDisplayRemoved) {
       display_manager->GetCurrentDisplayIdList();
   int64_t primary_display_id = display_ids[0];
   int64_t secondary_display_id = display_ids[1];
-  display_manager->SetLayoutForCurrentDisplays(
-      test::CreateDisplayLayout(display::DisplayPlacement::LEFT, 0));
+  display_manager->SetLayoutForCurrentDisplays(test::CreateDisplayLayout(
+      display_manager, display::DisplayPlacement::LEFT, 0));
 
   // The overlay should belong to the secondary root window.
   StickyKeysOverlay overlay;