1 files changed, 0 insertions, 39 deletions
diff --git a/layout/generic/nsFlexContainerFrame.cpp b/layout/generic/nsFlexContainerFrame.cpp
index b4907a4862..02d15b5907 100644
--- a/layout/generic/nsFlexContainerFrame.cpp
+++ b/layout/generic/nsFlexContainerFrame.cpp
@@ -1990,10 +1990,6 @@ FlexItem::FlexItem(ReflowInput& aFlexItemReflowInput,
              "placeholder frames should not be treated as flex items");
   MOZ_ASSERT(!(mFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW),
              "out-of-flow frames should not be treated as flex items");
-  MOZ_ASSERT(mIsInlineAxisMainAxis ==
-             nsFlexContainerFrame::IsItemInlineAxisMainAxis(mFrame),
-             "public API should be consistent with internal state (about "
-             "whether flex item's inline axis is flex container's main axis)");
 
   const ReflowInput* containerRS = aFlexItemReflowInput.mParentReflowInput;
   if (IsLegacyBox(containerRS->mFrame)) {
@@ -4425,41 +4421,6 @@ nsFlexContainerFrame::CalculatePackingSpace(uint32_t aNumThingsToPack,
   *aPackingSpaceRemaining -= totalEdgePackingSpace;
 }
 
-/* static */
-bool
-nsFlexContainerFrame::IsItemInlineAxisMainAxis(nsIFrame* aFrame)
-{
-  MOZ_ASSERT(aFrame && aFrame->IsFlexItem(), "expecting arg to be a flex item");
-  const WritingMode flexItemWM = aFrame->GetWritingMode();
-  const nsIFrame* flexContainer = aFrame->GetParent();
-
-  if (IsLegacyBox(flexContainer)) {
-    // For legacy boxes, the main axis is determined by "box-orient", and we can
-    // just directly check if that's vertical, and compare that to whether the
-    // item's WM is also vertical:
-    bool boxOrientIsVertical =
-      (flexContainer->StyleXUL()->mBoxOrient == StyleBoxOrient::Vertical);
-    return flexItemWM.IsVertical() == boxOrientIsVertical;
-  }
-
-  // For modern CSS flexbox, we get our return value by asking two questions
-  // and comparing their answers.
-  // Question 1: does aFrame have the same inline axis as its flex container?
-  bool itemInlineAxisIsParallelToParent =
-    !flexItemWM.IsOrthogonalTo(flexContainer->GetWritingMode());
-
-  // Question 2: is aFrame's flex container row-oriented? (This tells us
-  // whether the flex container's main axis is its inline axis.)
-  auto flexDirection = flexContainer->StylePosition()->mFlexDirection;
-  bool flexContainerIsRowOriented =
-    flexDirection == NS_STYLE_FLEX_DIRECTION_ROW ||
-    flexDirection == NS_STYLE_FLEX_DIRECTION_ROW_REVERSE;
-
-  // aFrame's inline axis is its flex container's main axis IFF the above
-  // questions have the same answer.
-  return flexContainerIsRowOriented == itemInlineAxisIsParallelToParent;
-}
-
 void
 nsFlexContainerFrame::DoFlexLayout(nsPresContext*           aPresContext,
                                    ReflowOutput&     aDesiredSize,