Unity editor script to add a menu command that Reverts all selected prefabs. Includes safe confirmation dialogue and Undo support. Upgraded from FPSSample

RevertSelectedPrefabs.cs

using UnityEditor;
using UnityEngine;

public class RevertSelectedPrefabs
{
    [MenuItem("Tools/Revert Selected Prefabs")]
    static void Execute()
    {
        if (Selection.gameObjects.Length < 1) Debug.Log("No selection to revert.");
        if (EditorUtility.DisplayDialog("Revert Selected Prefabs?",
                "Are you sure you want to revert the selected prefabs? All overrides will be lost.", "Revert", "Do Not Revert"))
        {
            foreach (var gameObject in Selection.gameObjects)
            {
                Undo.RegisterCompleteObjectUndo(Selection.gameObjects, "Execute");
                PrefabUtility.RevertPrefabInstance(gameObject, InteractionMode.UserAction);
            }
        }
    }
}