[CSS Grid Layout] Remove old FIXME in RenderGrid::placeItemsOnGrid()

Source/core/rendering/RenderGrid.cpp

Index: Source/core/rendering/RenderGrid.cpp
diff --git a/Source/core/rendering/RenderGrid.cpp b/Source/core/rendering/RenderGrid.cpp
index 8dda784767969d0cb39c7a2208b537a678182900..3c4557247a6fa23683dcaf32af88aeabb582a07b 100644
--- a/Source/core/rendering/RenderGrid.cpp
+++ b/Source/core/rendering/RenderGrid.cpp
@@ -904,8 +904,6 @@ void RenderGrid::placeItemsOnGrid()
         if (child->isOutOfFlowPositioned())
             continue;
 
-        // FIXME: We never re-resolve positions if the grid is grown during auto-placement which may lead auto / <integer>
-        // positions to not match the author's intent. The specification is unclear on what should be done in this case.
         OwnPtr<GridSpan> rowPositions = GridResolvedPosition::resolveGridPositionsFromStyle(*style(), *child, ForRows);
         OwnPtr<GridSpan> columnPositions = GridResolvedPosition::resolveGridPositionsFromStyle(*style(), *child, ForColumns);
         if (!rowPositions || !columnPositions) {