duration_opened  1499 chrome/browser/history/history_backend.cc           url.extended_info.duration_opened +=
duration_opened   542 chrome/browser/history/history_types.h     int64 duration_opened;
duration_opened   108 chrome/browser/ui/webui/ntp/suggestions_source_top_sites.cc       if (suggested_url.extended_info.duration_opened) {
duration_opened   110 chrome/browser/ui/webui/ntp/suggestions_source_top_sites.cc                                suggested_url.extended_info.duration_opened);