Bug 1414198 - Include <functional> in nsNSSCertificate.h r=keeler

We've a report of a compilation error on a different system because
std::function was undefined.

MozReview-Commit-ID: 2MboMUdLzHj

--HG--
extra : rebase_source : be6d73506402a1838b96ce55e69b44dcb00949f1

security/manager/ssl/nsNSSCertificate.h

@@ -6,6 +6,8 @@
 #ifndef nsNSSCertificate_h
 #define nsNSSCertificate_h
 
+#include <functional>
+
 #include "ScopedNSSTypes.h"
 #include "certt.h"
 #include "nsCOMPtr.h"