Bug 852670 - Make nsContainerFrame::SetPropTableFrames return void since it's infallible.  r=bzbarsky
Bug 851841 - Make nsListBoxBodyFrame::RemoveChildFrame assertions fatal.  r=bzbarsky
Bug 851848 - Remove OOM checks for the result of NewLineBox now that PresArena allocations are infallible.  r=bzbarsky
Bug 851848 - Remove the OOM check for allocating the BulletFrame now that PresArena allocations are infallible.  r=bzbarsky
Bug 851849 - Make nsBlockFrame::AddFrames() return void since it can't fail, and non-virtual since it's not meant to be overridden. Add a post-condition that the given
aFrameList is empty.  r=bzbarsky
Bug 851847 - Optimize nsBlockFrame::StealFrame when removing a normal flow child.  r=bzbarsky