code: function removePopUp($popUp) {
          // check visible first to help protect against recursive calls
          // via removeHandler
          if ($popUp.find(":visible").length > 0) {
              var removeHandler = $popUp.data("PopUpManager-removeHandler");
              if (removeHandler) {
                  removeHandler();
              }
          }
  
          // check index after removeHandler is done processing to protect
          // against recursive calls
          var index = _popUps.indexOf($popUp[0]);
          if (index >= 0) {
              var autoRemove = $popUp.data("PopUpManager-autoRemove");
              if (autoRemove) {
                  $popUp.remove();
                  _popUps.splice(index, 1);
              }
          }
      }
docs: Remove Esc key handling for a pop-up. Removes the pop-up from the DOM
  if the pop-up is currently visible and was not originally attached.
  
  @param {!jQuery} $popUp