security: Clean up IdentityManager: remove unused #include <stdexcept>.
diff --git a/ndn-cpp/security/identity/identity-manager.cpp b/ndn-cpp/security/identity/identity-manager.cpp
index c723064..c925f8f 100644
--- a/ndn-cpp/security/identity/identity-manager.cpp
+++ b/ndn-cpp/security/identity/identity-manager.cpp
@@ -6,9 +6,6 @@
* See COPYING for copyright and distribution information.
*/
-#if 1 // TODO: Remove this when we don't throw "not implemented".
-#include <stdexcept>
-#endif
#include <ndn-cpp/ndn-cpp-config.h>
#if NDN_CPP_HAVE_TIME_H
#include <time.h>