Bug 394114 Interfaces missing from various QI implementations.

jsdContext
r=caillon sr=jag a=dsicore

js/jsd/jsd_xpc.cpp

@@ -788,7 +788,7 @@ jsds_ScriptHookProc (JSDContext* jsdc, JSDScript* jsdscript, JSBool creating,
 
 /* Contexts */
 /*
-NS_IMPL_THREADSAFE_ISUPPORTS1(jsdContext, jsdIContext); 
+NS_IMPL_THREADSAFE_ISUPPORTS2(jsdContext, jsdIContext, jsdIEphemeral);
 
 NS_IMETHODIMP
 jsdContext::GetJSDContext(JSDContext **_rval)