Making UndoRedo7 use the EditMenu functions.

Since the ForwardButton and BackwardButtons were deleted for
CameraUndo/Redo, the test will use the CameraUndo/Redo from the EditMenu.

Change-Id: I3b430a939777371871b8ea4c3d114d7f62a8df6e
Merge topic '0013752-move-selection-toolbar-above-3d-view' into next

25274cc Making UndoRedo7 use the EditMenu functions.