Remove duplicated "total" time logging

Summary: This is useless as it's logged as key: total anyway.

Reviewed By: mweststrate

Differential Revision: D19501099

fbshipit-source-id: 08dcf76fbab8065356b34c6ed1524ef83703c46c

src/dispatcher/tracking.tsx

@@ -79,9 +79,6 @@ export default (store: Store, logger: Logger) => {
 
     logger.track('usage', TIME_SPENT_EVENT, usageSummary.total);
     for (const key of Object.keys(usageSummary)) {
-      if (key === 'total') {
-        logger.track('usage', TIME_SPENT_EVENT, usageSummary.total);
-      }
       logger.track('usage', TIME_SPENT_EVENT, usageSummary[key], key);
     }