Backed out changeset 5abed7bd3cb7 (bug 838014)
Backed out changeset b5ec7ce219b2 (bug 838014)
Backed out changeset ced35810adb2 (bug 838014). Again.
Bug 839302: Simplify logic in nsBlockFrame::DrainSelfOverflowList, and replace delete w/ nsAutoPtr. r=mats