Removing dead code from NetworkActionPredictor.

BUG=none


Review URL: http://codereview.chromium.org/9358062

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@121926 0039d316-1c4b-4281-b951-d872f2087c98
bool NetworkActionPredictor::TryDeleteOldEntries(HistoryService* service) {
  if (!service)
    return false;

  history::URLDatabase* url_db = service->InMemoryDatabase();
  if (!url_db)
    return false;

  DeleteOldEntries(url_db);
  return true;
}

bool NetworkActionPredictor::TryDeleteOldEntries(HistoryService* service) {
  if (!service)
    return false;

  history::URLDatabase* url_db = service->InMemoryDatabase();
  if (!url_db)
    return false;

  DeleteOldEntries(url_db);
  return true;
}
