Rename net::ct::LogEntry to SignedEntryData and clarify the comment.

net/cert/merkle_tree_leaf.cc

Index: net/cert/merkle_tree_leaf.cc
diff --git a/net/cert/merkle_tree_leaf.cc b/net/cert/merkle_tree_leaf.cc
index 5dfe08e350f02d19f65b49598893e8c50e1bfe47..5fb2eba4b26583387e3cb134e0a447dac44a5a3e 100644
--- a/net/cert/merkle_tree_leaf.cc
+++ b/net/cert/merkle_tree_leaf.cc
@@ -36,14 +36,14 @@ bool GetMerkleTreeLeaf(const X509Certificate* cert,
                        MerkleTreeLeaf* merkle_tree_leaf) {
   if (sct->origin == SignedCertificateTimestamp::SCT_EMBEDDED) {
     if (cert->GetIntermediateCertificates().empty() ||
-        !GetPrecertLogEntry(cert->os_cert_handle(),
-                            cert->GetIntermediateCertificates().front(),
-                            &merkle_tree_leaf->log_entry)) {
+        !GetPrecertSignedEntry(cert->os_cert_handle(),
+                               cert->GetIntermediateCertificates().front(),
+                               &merkle_tree_leaf->signed_entry)) {
       return false;
     }
   } else {
-    if (!GetX509LogEntry(cert->os_cert_handle(),
-                         &merkle_tree_leaf->log_entry)) {
+    if (!GetX509SignedEntry(cert->os_cert_handle(),
+                            &merkle_tree_leaf->signed_entry)) {
       return false;
     }
   }