Bug 814497 - Fix nsScriptErrorWithStack constructor. r=ehsan

js/xpconnect/src/xpcprivate.h

@@ -3030,7 +3030,7 @@ protected:
 
 class nsScriptErrorWithStack : public nsScriptError {
 public:
-    nsScriptErrorWithStack(JS::HandleObject);
+    explicit nsScriptErrorWithStack(JS::HandleObject);
 
     NS_DECL_CYCLE_COLLECTING_ISUPPORTS
     NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsScriptErrorWithStack)