Chrome incorrectly honors "align-content" in "flex-wrap: wrap" flex containers that only have a sin…

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 1191 matching lines @@
         mainAxisOffset -= flowAwareMarginStartForChild(child);
 
         ++seenInFlowPositionedChildren;
         if (seenInFlowPositionedChildren < numberOfChildrenForJustifyContent)
             mainAxisOffset -= justifyContentSpaceBetweenChildren(availableFreeSpace, style()->justifyContent(), numberOfChildrenForJustifyContent);
     }
 }
 
 static LayoutUnit initialAlignContentOffset(LayoutUnit availableFreeSpace, EAlignContent alignContent, unsigned numberOfLines)
 {
+    if (numberOfLines <= 1)
+        return 0;
     if (alignContent == AlignContentFlexEnd)
         return availableFreeSpace;
     if (alignContent == AlignContentCenter)
         return availableFreeSpace / 2;
     if (alignContent == AlignContentSpaceAround) {
         if (availableFreeSpace > 0 && numberOfLines)
             return availableFreeSpace / (2 * numberOfLines);
         if (availableFreeSpace < 0)
             return availableFreeSpace / 2;
     }
@@ skipping 189 matching lines @@
             ASSERT(child);
             LayoutUnit lineCrossAxisExtent = lineContexts[lineNumber].crossAxisExtent;
             LayoutUnit originalOffset = lineContexts[lineNumber].crossAxisOffset - crossAxisStartEdge;
             LayoutUnit newOffset = contentExtent - originalOffset - lineCrossAxisExtent;
             adjustAlignmentForChild(child, newOffset - originalOffset);
         }
     }
 }
 
 }