Update externs.
Update externs.

bramstein/fontfaceobserver,iksi/fontfaceobserver,matuzo/fontfaceobserver,iksi/fontfaceobserver,bramstein/fontfaceobserver,ttamminen/fontfaceobserver,kevinrodbe/fontfaceobserver,matuzo/fontfaceobserver,kevinrodbe/fontfaceobserver,ttamminen/fontfaceobserver