Bug 925382.  Error out of unified bindings if one of them includes windows.h.  r=froydnj
Bug 933193 part 1.  Factor out the id selector fast-path from querySelector(All) so we can reuse it a bit more broadly.  r=smaug
Bug 933193 part 2.  Implement nsINode::GetElementById and make SVGSVGElement use it.  r=smaug
Bug 933193 part 3.  Add getElementById to ParentNode.  r=smaug