encoding: delete deprecated tlv::ConentType

refs #2129

Change-Id: Id159f80c516ef1bd1a87b3c71c26929d7007970d
diff --git a/src/encoding/tlv.hpp b/src/encoding/tlv.hpp
index c1c9b99..bb0f1c5 100644
--- a/src/encoding/tlv.hpp
+++ b/src/encoding/tlv.hpp
@@ -100,9 +100,6 @@
   ContentType_Key = 2
 };
 
-/// @deprecated use ContentType instead
-typedef ContentTypeValue ConentType;
-
 /**
  * @brief Read VAR-NUMBER in NDN-TLV encoding
  *