Popup " Are you sure you want to delete the selected files?" is shown even when the user is deleting a single file.

[sana20]

1. Launch Application.
2. Create a new project.
3. Create a new scene file.
4. In the resource inspector, select the scene file and delete it.

-- Result: A Popup " Are you sure you want to delete the selected files?" is shown even when the user is deleting a single file.

-- Expected Result: A Popup " Are you sure you want to delete the selected file?" should be shown when the user is deleting a single file.

This happened 3/3 times.

Mac OS X: 10.9.5 XCode Version: 6.1 SB Version: Latest Develop branch(2.x)