code: func (c *Page) SetFontSizes(fontSizes *PageFontSizes) (*gcdmessage.ChromeResponse, error) {
  	var v PageSetFontSizesParams
  	v.FontSizes = fontSizes
  	return c.SetFontSizesWithParams(&v)
  }
docs: // SetFontSizes - Set default font sizes.
  // fontSizes - Specifies font sizes to set. If a font size is not specified, it won't be changed.