--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -1068,17 +1068,17 @@ nsFrameConstructorState::PushAbsoluteCon
 
   mAbsoluteItems =
     nsAbsoluteItems(AdjustAbsoluteContainingBlock(aNewAbsoluteContainingBlock));
 
   /* See if we're wiring the fixed-pos and abs-pos lists together.  This happens iff
    * we're a transformed element.
    */
   mFixedPosIsAbsPos = aPositionedFrame &&
-      aPositionedFrame->StyleDisplay()->IsFixedPosContainingBlock(aPositionedFrame);
+      aPositionedFrame->IsFixedPosContainingBlock();
 
   if (aNewAbsoluteContainingBlock) {
     aNewAbsoluteContainingBlock->MarkAsAbsoluteContainingBlock();
   }
 }
 
 void
 nsFrameConstructorState::PushFloatContainingBlock(nsContainerFrame* aNewFloatContainingBlock,
@@ -6148,17 +6148,17 @@ nsCSSFrameConstructor::GetAbsoluteContai
     // parent frame, unless we're dealing with a scrollframe.
     // Scrollframes are special since they're not positioned, but their
     // scrolledframe might be.  So, we need to check this special case to return
     // the correct containing block (the scrolledframe) in that case.
     // If we're looking for a fixed-pos containing block and the frame is
     // not transformed, skip it.
     if (!frame->IsAbsPosContainingBlock() ||
         (aType == FIXED_POS &&
-         !frame->StyleDisplay()->IsFixedPosContainingBlock(frame))) {
+         !frame->IsFixedPosContainingBlock())) {
       continue;
     }
     nsIFrame* absPosCBCandidate = frame;
     nsIAtom* type = absPosCBCandidate->GetType();
     if (type == nsGkAtoms::fieldSetFrame) {
       absPosCBCandidate = static_cast<nsFieldSetFrame*>(absPosCBCandidate)->GetInner();
       if (!absPosCBCandidate) {
         continue;