--- a/dom/base/Selection.cpp
+++ b/dom/base/Selection.cpp
@@ -4114,26 +4114,16 @@ Selection::ResetColors()
 }
 
 void
 Selection::ResetColors(ErrorResult& aRv)
 {
   mCustomColors = nullptr;
 }
 
-NS_IMETHODIMP_(nsDirection)
-Selection::GetSelectionDirection() {
-  return mDirection;
-}
-
-NS_IMETHODIMP_(void)
-Selection::SetSelectionDirection(nsDirection aDirection) {
-  mDirection = aDirection;
-}
-
 JSObject*
 Selection::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
 {
   return mozilla::dom::SelectionBinding::Wrap(aCx, this, aGivenProto);
 }
 
 // AutoHideSelectionChanges
 AutoHideSelectionChanges::AutoHideSelectionChanges(const nsFrameSelection* aFrame)

--- a/dom/base/nsISelectionPrivate.idl
+++ b/dom/base/nsISelectionPrivate.idl
@@ -27,22 +27,16 @@ struct ScrollAxis;
 [ref] native nsPointRef(nsPoint);
 native nsDirection(nsDirection);
 native ScrollAxis(nsIPresShell::ScrollAxis);
 
 [uuid(0c9f4f74-ee7e-4fe9-be6b-0ba856368178)]
 interface nsISelectionPrivate : nsISupports
 {
     /**
-     * Get the direction of the selection.
-     */
-    [noscript, notxpcom] nsDirection getSelectionDirection();
-    [noscript, notxpcom] void setSelectionDirection(in nsDirection aDirection);
-
-    /**
      * Returns the type of the selection (see nsISelectionController for
      * available constants).
      */
     readonly attribute short type;
 
     /**
      * Return array of ranges intersecting with the given DOM interval.
      */

--- a/dom/html/nsTextEditorState.cpp
+++ b/dom/html/nsTextEditorState.cpp
@@ -1657,17 +1657,17 @@ nsTextEditorState::GetSelectionDirection
   }
 
   Selection* sel = mSelCon->GetSelection(SelectionType::eNormal);
   if (NS_WARN_IF(!sel)) {
     aRv.Throw(NS_ERROR_FAILURE);
     return nsITextControlFrame::eForward; // Doesn't really matter
   }
 
-  nsDirection direction = sel->GetSelectionDirection();
+  nsDirection direction = sel->GetDirection();
   if (direction == eDirNext) {
     return nsITextControlFrame::eForward;
   }
 
   MOZ_ASSERT(direction == eDirPrevious);
   return nsITextControlFrame::eBackward;
 }
 

--- a/layout/forms/nsTextControlFrame.cpp
+++ b/layout/forms/nsTextControlFrame.cpp
@@ -882,39 +882,36 @@ nsTextControlFrame::SetSelectionInternal
   NS_ASSERTION(txtCtrl, "Content not a text control element");
   nsISelectionController* selCon = txtCtrl->GetSelectionController();
   NS_ENSURE_TRUE(selCon, NS_ERROR_FAILURE);
 
   RefPtr<Selection> selection =
     selCon->GetSelection(nsISelectionController::SELECTION_NORMAL);
   NS_ENSURE_TRUE(selection, NS_ERROR_FAILURE);
 
-  nsCOMPtr<nsISelectionPrivate> selPriv = do_QueryObject(selection, &rv);
-  NS_ENSURE_SUCCESS(rv, rv);
-
   nsDirection direction;
   if (aDirection == eNone) {
     // Preserve the direction
-    direction = selPriv->GetSelectionDirection();
+    direction = selection->GetDirection();
   } else {
     direction = (aDirection == eBackward) ? eDirPrevious : eDirNext;
   }
 
   ErrorResult err;
   selection->RemoveAllRanges(err);
   if (NS_WARN_IF(err.Failed())) {
     return err.StealNSResult();
   }
 
   selection->AddRange(*range, err);  // NOTE: can destroy the world
   if (NS_WARN_IF(err.Failed())) {
     return err.StealNSResult();
   }
 
-  selPriv->SetSelectionDirection(direction);
+  selection->SetDirection(direction);
   return rv;
 }
 
 nsresult
 nsTextControlFrame::ScrollSelectionIntoView()
 {
   nsCOMPtr<nsITextControlElement> txtCtrl = do_QueryInterface(GetContent());
   NS_ASSERTION(txtCtrl, "Content not a text control element");