Removed commented-out code from Callback

Author: japgolly

core/src/main/scala/japgolly/scalajs/react/Callback.scala

@@ -338,11 +338,6 @@ final class CallbackTo[A] private[react] (private[CallbackTo] val f: () => A) ex
   def isEmpty_? : Boolean =
     f eq Callback.empty.f
 
-//  def flatMapUnlessEmpty(g: Callback => Callback)(implicit ev: This =:= Callback): Callback = {
-//    val c = ev(this)
-//    if (isEmpty_?) c else g(c)
-//  }
-
   /**
    * Log to the console before this callback starts, and after it completes.
    *
@@ -468,32 +463,4 @@ final class CallbackTo[A] private[react] (private[CallbackTo] val f: () => A) ex
    */
   def !(implicit ev: ThisIsBool): CallbackB =
     ev(this).map(!_)
-
-//  /**
-//   * Sequence the given callback to be run when the result of this is `true`.
-//   *
-//   * The result is discarded.
-//   */
-//  def whenTrueRun[B](c: CallbackTo[B])(implicit ev: ThisIsBool): Callback =
-//    ev(this).map(a => if (a) c.f())
-//
-//  /**
-//   * Alias for `whenTrueRun`.
-//   */
-//  @inline def ?>>[B](c: CallbackTo[B])(implicit ev: ThisIsBool): Callback =
-//    whenTrueRun(c)
-//
-//  /**
-//   * Sequence the given callback to be run when the result of this is `true`.
-//   *
-//   * Returns the result wrapped in `Option`.
-//   */
-//  def whenTrue[B](c: CallbackTo[B])(implicit ev: ThisIsBool): CallbackTo[Option[B]] =
-//    ev(this).map(a => if (a) Some(c.f()) else None)
-//
-//  /**
-//   * Alias for `whenTrue`.
-//   */
-//  @inline def ?>>?[B](c: CallbackTo[B])(implicit ev: ThisIsBool): CallbackTo[Option[B]] =
-//    whenTrue(c)
 }