Relocate display_manager from ash to ui

ash/display/extended_mouse_warp_controller.h

Index: ash/display/extended_mouse_warp_controller.h
diff --git a/ash/display/extended_mouse_warp_controller.h b/ash/display/extended_mouse_warp_controller.h
index 64f6ac756344f67eaf0030b72633ec2c0016b262..b04488299f3413ba00075eeb23b1102ba1b7abe9 100644
--- a/ash/display/extended_mouse_warp_controller.h
+++ b/ash/display/extended_mouse_warp_controller.h
@@ -29,7 +29,6 @@ class Point;
 namespace ash {
 namespace test {
 class AshTestBase;
-class DisplayManagerTestApi;
 }
 class SharedDisplayEdgeIndicator;
 
@@ -45,7 +44,6 @@ class ASH_EXPORT ExtendedMouseWarpController : public MouseWarpController {
 
  private:
   friend class test::AshTestBase;
-  friend class test::DisplayManagerTestApi;
   friend class ExtendedMouseWarpControllerTest;
   FRIEND_TEST_ALL_PREFIXES(ExtendedMouseWarpControllerTest,
                            IndicatorBoundsTestThreeDisplays);