Bug 1600542 - Remove no longer used nsGridContainerFrame special-case. r=layout-reviewers,tlouw

      iMinSizeClamp = aMinSizeClamp;

    }

    LogicalSize availableSize(childWM, availISize, availBSize);

    if (MOZ_UNLIKELY(child->IsXULBoxFrame())) {

      auto* pc = child->PresContext();

      // For XUL-in-CSS-Grid (e.g. in our frontend code), we defer to XUL's

      // GetPrefSize() function (which reports an answer in both axes), instead

      // of actually reflowing.  It's important to avoid the "measuring + final"

      // two-pass reflow for XUL, because some XUL layout code may incorrectly

      // optimize away the second reflow in cases where it's really needed.

      // XXXdholbert We'll remove this special case in bug 1600542.

      ReflowInput childRI(pc, *aState.mReflowInput, child, availableSize,

                          Some(cbSize));

      nsBoxLayoutState state(pc, &aState.mRenderingContext, &childRI,

                             childRI.mReflowDepth);

      nsSize physicalPrefSize = child->GetXULPrefSize(state);

      auto prefSize = LogicalSize(childWM, physicalPrefSize);

      size = prefSize.BSize(childWM);

      // XXXdholbert This won't have percentage margins resolved.

      // Hopefully we can just avoid those for XUL-content-in-css-grid?

      size += childRI.ComputedLogicalMargin(childWM).BStartEnd(childWM);

    } else {

    size = ::MeasuringReflow(child, aState.mReflowInput, aRC, availableSize,

                             cbSize, iMinSizeClamp, bMinSizeClamp);

    size += child->GetLogicalUsedMargin(childWM).BStartEnd(childWM);

    }

    nscoord overflow = size - aMinSizeClamp;

    if (MOZ_UNLIKELY(overflow > 0)) {

      nscoord contentSize = child->ContentSize(childWM).BSize(childWM);