How to remove style attribute when applying styles in ckeditor 4?

Question

CKEditor

How to remove style attribute when applying styles in ckeditor 4? I need that when my style is selected from the list, a certain class is added to the element, but its width and height are removed (or better, the entire style attribute).
Here's what you can prescribe in the styles section to remove the width and height from there?

{
  name: 'Full Size Image',
  element: 'img',
  attributes: { 'class': 'autoSize' },
  styles: {
    'width':'',
    'height':''
  }
},