Revert of Use platform's device scale factor for cursor

ash/wm/ash_native_cursor_manager_interactive_uitest.cc

Index: ash/wm/ash_native_cursor_manager_interactive_uitest.cc
diff --git a/ash/wm/ash_native_cursor_manager_interactive_uitest.cc b/ash/wm/ash_native_cursor_manager_interactive_uitest.cc
index 83df158964464be84e5c6cc8d9a7d1019508f9f9..5eee024bc47989352bf854ca777ea90e28f96581 100644
--- a/ash/wm/ash_native_cursor_manager_interactive_uitest.cc
+++ b/ash/wm/ash_native_cursor_manager_interactive_uitest.cc
@@ -102,10 +102,10 @@
   display_manager->OnNativeDisplaysChanged(display_info_list);
 
   MoveMouseSync(Shell::GetAllRootWindows()[0], 10, 10);
-  EXPECT_EQ(1.0f, test_api.GetCurrentCursor().device_scale_factor());
+  EXPECT_EQ(1.0f, test_api.GetDisplay().device_scale_factor());
 
   MoveMouseSync(Shell::GetAllRootWindows()[0], 600, 10);
-  EXPECT_EQ(2.0f, test_api.GetCurrentCursor().device_scale_factor());
+  EXPECT_EQ(2.0f, test_api.GetDisplay().device_scale_factor());
 }
 
 }  // namespace ash