Bug 1052052 - Hoist AutoCxPusher into ScriptSettings.h. r=gabor
Bug 1052052 - Hoist Auto*JSContext into nsContentUtils and kill nsCxPusher.{cpp,h}. r=gabor
Bug 1052052 - Convert AutoJSContext to AutoJSAPI. r=gabor

With this change, the only cx push left in the tree happens inside of AutoJSAPI. \o/