Flex box word-wrap is not adhering to spec

Source/core/rendering/RenderFlexibleBox.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 296 matching lines @@
 {
     for (RenderBox* child = m_orderIterator.first(); child; child = m_orderIterator.next())
         paintChildAsInlineBlock(child, paintInfo, paintOffset);
 }
 
 void RenderFlexibleBox::repositionLogicalHeightDependentFlexItems(Vector<LineContext>& lineContexts)
 {
     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);
 
     if (style()->flexWrap() == FlexWrapReverse)
         flipForWrapReverse(lineContexts, crossAxisStartEdge);
 
     // direction:rtl + flex-direction:column means the cross-axis direction is flipped.
     flipForRightToLeftColumn();
 }
 
@@ skipping 1083 matching lines @@
             ASSERT(child);
             LayoutUnit lineCrossAxisExtent = lineContexts[lineNumber].crossAxisExtent;
             LayoutUnit originalOffset = lineContexts[lineNumber].crossAxisOffset - crossAxisStartEdge;
             LayoutUnit newOffset = contentExtent - originalOffset - lineCrossAxisExtent;
             adjustAlignmentForChild(child, newOffset - originalOffset);
         }
     }
 }
 
 }