Bug 868266.  Root the arguments list in nsObjectLoadingContent::LegacyCall.  r=terrence
Bug 865969 part 1.  Better rooting in bindings for 'object' arguments, as well as for worker interface arguments passed as JSObject*.  r=smaug
Bug 865969 part 2.  Better rooting in bindings for 'any' arguments.  r=smaug
Bug 865969 part 3.  Add ways of creating Handle<Value> holding null and undefined values.  r=terrence
Bug 865969 part 4.  Pass handles to WebIDL dictionary init.  r=smaug,terrence
Bug 865969 part 5.  Root the id argument of WebIDL DefineInterface methods.  r=smaug
Bug 865969 part 6.  Fix rooting hazards in BindingUtils.cpp.  r=smaug
Bug 865969 part 7.  Fix rooting hazards in DOMJSProxyHandler.cpp.  r=ms2ger
Bug 865969 part 8.  Fix rooting hazards in CallbackObject.  r=ms2ger
Bug 865969 part 9.  Remaining miscellaneous rooting fixes in WebIDL bindings.  r=ms2ger