dbwrapper: Remove CDBWrapper::GetObfuscateKeyHex

It is an unnecessary method as it is used only two times
and only internally, and the whole implementation is
HexStr(obfuscate_key).

src/dbwrapper.cpp

@@ -84,10 +84,10 @@ CDBWrapper::CDBWrapper(const boost::filesystem::path& path, size_t nCacheSize, b
         Write(OBFUSCATE_KEY_KEY, new_key);
         obfuscate_key = new_key;
 
-        LogPrintf("Wrote new obfuscate key for %s: %s\n", path.string(), GetObfuscateKeyHex());
+        LogPrintf("Wrote new obfuscate key for %s: %s\n", path.string(), HexStr(obfuscate_key));
     }
 
-    LogPrintf("Using obfuscation key for %s: %s\n", path.string(), GetObfuscateKeyHex());
+    LogPrintf("Using obfuscation key for %s: %s\n", path.string(), HexStr(obfuscate_key));
 }
 
 CDBWrapper::~CDBWrapper()
@@ -141,11 +141,6 @@ const std::vector<unsigned char>& CDBWrapper::GetObfuscateKey() const
     return obfuscate_key;
 }
 
-std::string CDBWrapper::GetObfuscateKeyHex() const
-{
-    return HexStr(obfuscate_key);
-}
-
 CDBIterator::~CDBIterator() { delete piter; }
 bool CDBIterator::Valid() { return piter->Valid(); }
 void CDBIterator::SeekToFirst() { piter->SeekToFirst(); }

src/dbwrapper.h

@@ -268,12 +268,6 @@ public:
      * Accessor for obfuscate_key.
      */
     const std::vector<unsigned char>& GetObfuscateKey() const;
-
-    /**
-     * Return the obfuscate_key as a hex-formatted string.
-     */
-    std::string GetObfuscateKeyHex() const;
-
 };
 
 #endif // BITCOIN_DBWRAPPER_H