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

net/cert/signed_certificate_timestamp.cc

Index: net/cert/signed_certificate_timestamp.cc
diff --git a/net/cert/signed_certificate_timestamp.cc b/net/cert/signed_certificate_timestamp.cc
index 489c88c6c1941bd568772fa2ad80ec66d3b54967..9096fdec1023aa545722fa5c3b047050a7497a98 100644
--- a/net/cert/signed_certificate_timestamp.cc
+++ b/net/cert/signed_certificate_timestamp.cc
@@ -78,12 +78,12 @@ SignedCertificateTimestamp::CreateFromPickle(base::PickleIterator* iter) {
   return sct;
 }
 
-LogEntry::LogEntry() : type(LOG_ENTRY_TYPE_X509) {}
+SignedEntryData::SignedEntryData() : type(LOG_ENTRY_TYPE_X509) {}
 
-LogEntry::~LogEntry() {}
+SignedEntryData::~SignedEntryData() {}
 
-void LogEntry::Reset() {
-  type = LogEntry::LOG_ENTRY_TYPE_X509;
+void SignedEntryData::Reset() {
+  type = SignedEntryData::LOG_ENTRY_TYPE_X509;
   leaf_certificate.clear();
   tbs_certificate.clear();
 }