Bug 1294918 - Use helper method nsIFrame::IsFixedPosContainingBlock. r=dholbert

MozReview-Commit-ID: 5fdGqLSOjvs

--HG--
extra : rebase_source : c06406f5022b45e9bc995af8e867fe3f44441d23

layout/base/nsCSSFrameConstructor.cpp

@@ -1073,7 +1073,7 @@ nsFrameConstructorState::PushAbsoluteContainingBlock(nsContainerFrame* aNewAbsol
    * we're a transformed element.
    */
   mFixedPosIsAbsPos = aPositionedFrame &&
-      aPositionedFrame->StyleDisplay()->IsFixedPosContainingBlock(aPositionedFrame);
+      aPositionedFrame->IsFixedPosContainingBlock();
 
   if (aNewAbsoluteContainingBlock) {
     aNewAbsoluteContainingBlock->MarkAsAbsoluteContainingBlock();
@@ -6153,7 +6153,7 @@ nsCSSFrameConstructor::GetAbsoluteContainingBlock(nsIFrame* aFrame,
     // not transformed, skip it.
     if (!frame->IsAbsPosContainingBlock() ||
         (aType == FIXED_POS &&
-         !frame->StyleDisplay()->IsFixedPosContainingBlock(frame))) {
+         !frame->IsFixedPosContainingBlock())) {
       continue;
     }
     nsIFrame* absPosCBCandidate = frame;