After update gnome 2 to gnome 3, the key delete no erase files, I have that click button right and move to trash.

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Quick fix:
Run dconf-editor, and open:
org -> gnome -> desktop -> interface
Enable “can-change-accels”.

Open nautilus, select any file/directory, then click “Edit” from menubar, and hover on “Move to Trash” menuitem.
While hovering, click on your delete key. The accel should change from “cntrl+del” to “del”.

Make sure you have selected a file, else the “Move to Trash” menuitem will be greyed out.

I suggest you disable “can-change-accels” afterwards, to prevent accidental accel changes.