Flex box word-wrap is not adhering to spec

Source/core/rendering/RenderFlexibleBox.cpp

Index: Source/core/rendering/RenderFlexibleBox.cpp
diff --git a/Source/core/rendering/RenderFlexibleBox.cpp b/Source/core/rendering/RenderFlexibleBox.cpp
index 62dfee372307b28119fa28e0ee64d50dc7fef3a5..d3cd3dd06d3d912700aec19a3503d598dfd4a6b0 100644
--- a/Source/core/rendering/RenderFlexibleBox.cpp
+++ b/Source/core/rendering/RenderFlexibleBox.cpp
@@ -314,9 +314,10 @@ void RenderFlexibleBox::repositionLogicalHeightDependentFlexItems(Vector<LineCon
     LayoutUnit crossAxisStartEdge = lineContexts.isEmpty() ? LayoutUnit() : lineContexts[0].crossAxisOffset;
     alignFlexLines(lineContexts);
 
-    // If we have a single line flexbox, the line height is all the available space.
+    // If we have a single line flexbox or a multiline line flexbox with only one flex line,
+    // the line height is all the available space.
     // For flex-direction: row, this means we need to use the height, so we do this after calling updateLogicalHeight.
-    if (!isMultiline() && lineContexts.size() == 1)
+    if (lineContexts.size() == 1)
         lineContexts[0].crossAxisExtent = crossAxisContentExtent();
     alignChildren(lineContexts);