Drop unnecessary v2 namespace qualifications

Change-Id: I6358bac6860ca8f2e9cdbd00bb2a929e3af5b2da
diff --git a/tests/unit/security/verification-helpers.t.cpp b/tests/unit/security/verification-helpers.t.cpp
index d930281..74ffbe0 100644
--- a/tests/unit/security/verification-helpers.t.cpp
+++ b/tests/unit/security/verification-helpers.t.cpp
@@ -546,7 +546,7 @@
 BOOST_AUTO_TEST_CASE_TEMPLATE(VerifySignature, Dataset, SignatureDatasets)
 {
   Dataset dataset;
-  v2::Certificate cert(Block(dataset.cert.data(), dataset.cert.size()));
+  Certificate cert(Block(dataset.cert.data(), dataset.cert.size()));
   Buffer keyRaw = cert.getPublicKey();
   transform::PublicKey key;
   key.loadPkcs8(keyRaw.data(), keyRaw.size());