code: func (c *Page) SetFontFamilies(fontFamilies *PageFontFamilies) (*gcdmessage.ChromeResponse, error) {
  	var v PageSetFontFamiliesParams
  	v.FontFamilies = fontFamilies
  	return c.SetFontFamiliesWithParams(&v)
  }
docs: // SetFontFamilies - Set generic font families.
  // fontFamilies - Specifies font families to set. If a font family is not specified, it won't be changed.