jQuery: removed redundant interface

jquery/jquery.d.ts

@@ -485,14 +485,6 @@ interface JQueryAnimationOptions {
     specialEasing?: Object;
 }
 
-/**
- * The interface used to specify easing functions.
- */
-interface JQueryEasing {
-    linear(p: number): number;
-    swing(p: number): number;
-}
-
 /**
  * Static members of jQuery (those on $ and jQuery themselves)
  */