src: Correcting coding style of security related code.

Change-Id: Iff09b16d8a86462aff0abbd202b82cebb74bc365
diff --git a/src/security/sec-public-info-sqlite3.hpp b/src/security/sec-public-info-sqlite3.hpp
index b89859a..6241817 100644
--- a/src/security/sec-public-info-sqlite3.hpp
+++ b/src/security/sec-public-info-sqlite3.hpp
@@ -51,7 +51,7 @@
   virtual void
   addPublicKey(const Name& keyName, KeyType keyType, const PublicKey& publicKeyDer);
 
-  virtual ptr_lib::shared_ptr<PublicKey>
+  virtual shared_ptr<PublicKey>
   getPublicKey(const Name& keyName);
 
   virtual bool
@@ -60,7 +60,7 @@
   virtual void
   addCertificate(const IdentityCertificate& certificate);
 
-  virtual ptr_lib::shared_ptr<IdentityCertificate>
+  virtual shared_ptr<IdentityCertificate>
   getCertificate(const Name& certificateName);