Add Certificate Transparency logs auditing

net/cert/merkle_audit_proof.cc

Index: net/cert/merkle_audit_proof.cc
diff --git a/net/cert/merkle_audit_proof.cc b/net/cert/merkle_audit_proof.cc
index f1829af1f3ef89f32935ed7b1853cb1f7fd1fb71..92ead5acabe6b9c45e2dfa81fae48320141a7f1a 100644
--- a/net/cert/merkle_audit_proof.cc
+++ b/net/cert/merkle_audit_proof.cc
@@ -30,12 +30,14 @@ uint64_t CalculateAuditPathLength(uint64_t leaf_index, uint64_t tree_size) {
 
 MerkleAuditProof::MerkleAuditProof() {}
 
+MerkleAuditProof::MerkleAuditProof(const MerkleAuditProof& other) = default;
+
 MerkleAuditProof::MerkleAuditProof(uint64_t leaf_index,
                                    uint64_t tree_size,
                                    const std::vector<std::string>& audit_path)
     : leaf_index(leaf_index), tree_size(tree_size), nodes(audit_path) {}
 
-MerkleAuditProof::~MerkleAuditProof() {}
+MerkleAuditProof::~MerkleAuditProof() = default;
 
 }  // namespace ct
 }  // namespace net