Remove stale-while-revalidate experimental implementation.

net/log/net_log_event_type_list.h

Index: net/log/net_log_event_type_list.h
diff --git a/net/log/net_log_event_type_list.h b/net/log/net_log_event_type_list.h
index d46cbfff788f43d72cf635027519cdedd7929313..23088d4b58924740586c3930b6609edb49aabc28 100644
--- a/net/log/net_log_event_type_list.h
+++ b/net/log/net_log_event_type_list.h
@@ -874,29 +874,6 @@ EVENT_TYPE(HTTP_CACHE_CALLER_REQUEST_HEADERS)
 EVENT_TYPE(HTTP_CACHE_RESTART_PARTIAL_REQUEST)
 EVENT_TYPE(HTTP_CACHE_RE_SEND_PARTIAL_REQUEST)
 
-// Identifies the NetLog::Source() for the asynchronous HttpCache::Transaction
-// that will revalidate this entry.
-// The event parameters are:
-//   {
-//      "source_dependency": <Source identifier for the async Transaction>
-//   }
-EVENT_TYPE(HTTP_CACHE_VALIDATE_RESOURCE_ASYNC)
-
-// The start/end of performing an async revalidation.
-// For the BEGIN phase, the event parameters are:
-//   {
-//      "source_dependency": <Source identifier for the Request>
-//      "url": <String of URL being loaded>,
-//      "method": <Method of request>
-//   }
-//
-// For the END phase, if there was an error, the following parameters are
-// attached:
-//   {
-//      "net_error": <Net error code of the failure>,
-//   }
-EVENT_TYPE(ASYNC_REVALIDATION)
-
 // ------------------------------------------------------------------------
 // Disk Cache / Memory Cache
 // ------------------------------------------------------------------------