Delete Pixel Layers.jsx

var doc = app.activeDocument;

doc.suspendHistory("Remove Normal Layers", "deletePixelLayers( doc )");

function deletePixelLayers(target)
{
    try{
        var layers = target.layers;
        for (var i = 0; i < layers.length; i++)
        {
            var curLayer = layers[i];

            // Layer is a group
            if ("LayerSet" == curLayer.typename) {
                deletePixelLayers(curLayer);
            }

            // Layer is a NORMAL (Pixel) Layers
            if (LayerKind.NORMAL == curLayer.kind
                && !curLayer.isBackgroundLayer) {

                curLayer.remove(); // Delete the layer
                --i;
            };
        };
    }catch(e){
        ; // do nothing
    }
};