also setting the internal area frame to use a space manager when necessary b=33200 Added asserts in LabelHack method to catch problem in Reflow Correctly set the avilable size to reflow available size instead of mComputedSize This caused the content to leak out. b=29276 git-svn-id: svn://10.0.0.236/trunk@64246 18797224-902f-48f8-a5cc-f745e15eee43