sync: Remove TrafficRecorder

The new protocol events framework handles all the use cases of the
TrafficRecorder, and more.  The traffic recorder implementation and about:sync
tab are now redundant.

BUG=357821

Review URL: https://codereview.chromium.org/217633003

git-svn-id: http://src.chromium.org/svn/trunk/src/build@261032 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

ios/grit_whitelist.txt

@@ -53,12 +53,10 @@ IDR_SYNC_INTERNALS_DATA_JS
 IDR_SYNC_INTERNALS_EVENTS_JS
 IDR_SYNC_INTERNALS_INDEX_HTML
 IDR_SYNC_INTERNALS_INDEX_JS
-IDR_SYNC_INTERNALS_NOTIFICATIONS_JS
 IDR_SYNC_INTERNALS_SEARCH_JS
 IDR_SYNC_INTERNALS_SYNC_LOG_JS
 IDR_SYNC_INTERNALS_SYNC_NODE_BROWSER_JS
 IDR_SYNC_INTERNALS_SYNC_SEARCH_JS
-IDR_SYNC_INTERNALS_TRAFFIC_JS
 IDR_THROBBER
 IDR_TRANSLATE_JS
 IDR_UPDATE_BADGE4