Bug 1174003 part 1: [css-flexbox] Remove unused method nsFlexContainerFrame::IsHorizontal. r=mats

MozReview-Commit-ID: JzvGzJvMhLS

--HG--
extra : rebase_source : 08916cb0fa201f036d69de41f7a3f760a6c081d9

layout/generic/nsFlexContainerFrame.cpp

@@ -1202,13 +1202,6 @@ nsFlexContainerFrame::CSSAlignmentForAbsPosChild(
   return alignment;
 }
 
-bool
-nsFlexContainerFrame::IsHorizontal()
-{
-  const FlexboxAxisTracker axisTracker(this, GetWritingMode());
-  return axisTracker.IsMainAxisHorizontal();
-}
-
 UniquePtr<FlexItem>
 nsFlexContainerFrame::GenerateFlexItemForChild(
   nsPresContext* aPresContext,

layout/generic/nsFlexContainerFrame.h

@@ -153,9 +153,6 @@ public:
             const ReflowInput& aChildRI,
             mozilla::LogicalAxis aLogicalAxis) const override;
 
-  // Flexbox-specific public methods
-  bool IsHorizontal();
-
   /**
    * Helper function to calculate packing space and initial offset of alignment
    * subjects in MainAxisPositionTracker() and CrossAxisPositionTracker() for