--- a/layout/generic/nsLineLayout.h
+++ b/layout/generic/nsLineLayout.h
@@ -418,23 +418,16 @@ protected:
   // justification and relative positioning).
 
   struct PerSpanData;
   struct PerFrameData;
   friend struct PerSpanData;
   friend struct PerFrameData;
   struct PerFrameData
   {
-    explicit PerFrameData(mozilla::WritingMode aWritingMode)
-      : mBounds(aWritingMode)
-      , mMargin(aWritingMode)
-      , mBorderPadding(aWritingMode)
-      , mOffsets(aWritingMode)
-    {}
-
     // link to next/prev frame in same span
     PerFrameData* mNext;
     PerFrameData* mPrev;
 
     // Link to the frame of next ruby annotation.  It is a linked list
     // through this pointer from ruby base to all its annotations.  It
     // could be nullptr if there is no more annotation.
     // If PFD_ISLINKEDTOBASE is set, the current PFD is one of the ruby