Certificate Transparency: MerkleTreeLeaf, MerkleAuditProof improvements.

net/cert/merkle_audit_proof.h

Index: net/cert/merkle_audit_proof.h
diff --git a/net/cert/merkle_audit_proof.h b/net/cert/merkle_audit_proof.h
index 2f6fdb93b9fd83036e7e3d48270e0df84106d053..b214891ee145ee74218f488d8d21e1965fd5c7dd 100644
--- a/net/cert/merkle_audit_proof.h
+++ b/net/cert/merkle_audit_proof.h
@@ -25,14 +25,10 @@ NET_EXPORT uint64_t CalculateAuditPathLength(uint64_t leaf_index,
 // Audit proof for a Merkle tree leaf, as defined in section 2.1.1. of RFC6962.
 struct NET_EXPORT MerkleAuditProof {
   MerkleAuditProof();
-  MerkleAuditProof(const std::string& log_id,
-                   uint64_t leaf_index,
+  MerkleAuditProof(uint64_t leaf_index,
                    const std::vector<std::string>& audit_path);
   ~MerkleAuditProof();
 
-  // The origin of this proof.
-  std::string log_id;
-
   // Index of the tree leaf in the log.
   uint64_t leaf_index = 0;