Bug 901364 - Hoist slow script prompt machinery into nsGlobalWindow. r=mrbkap
Bug 901364 - Implement a replacement operation callback in XPConnect. r=mrbkap
Bug 901364 - Switch to the XPConnect operation callback for DOM windows. r=mrbkap
Bug 901364 - Make operation callbacks runtime-wide. r=mrbkap
Bug 901364 - Remove a bunch of now-unused modal state tracking machinery. r=mrbkap