Roll out the layout optimizations to flexing. They aren't super-important anyway, and the repainting optimizations are still intact.
Created attachment 201629 [details]
Attachment 201629 [details] did not pass style-queue:
Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/WebCore/ChangeLog', u'Source/WebCore/rendering/RenderDeprecatedFlexibleBox.cpp']" exit_code: 1
Source/WebCore/rendering/RenderDeprecatedFlexibleBox.cpp:391: Omit int when using unsigned [runtime/unsigned] 
Total errors found: 1 in 2 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Landed in r150038.