Make sure that callback returns void to match WebIDL
Closes
@@ -33,7 +33,7 @@ var IdleCallbackOptions;
/**
* Schedules a callback to run when the browser is idle.
- * @param {function(!IdleDeadline)} callback Called when the browser is idle.
+ * @param {function(!IdleDeadline): void} callback Called when the browser is idle.
* @param {number|IdleCallbackOptions=} opt_options If set, gives the browser a time in ms by which
* it must execute the callback. No timeout enforced otherwise.
* @return {number} A handle that can be used to cancel the scheduled callback.
