Move RC4 behind a fallback.

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 ee7a5994837aa15f2413300a7b1758b47ae28968..b20dec733ada789e686fcd7188fca378b861494b 100644
--- a/net/log/net_log_event_type_list.h
+++ b/net/log/net_log_event_type_list.h
@@ -494,6 +494,15 @@ EVENT_TYPE(SSL_WRITE_ERROR)
 //   }
 EVENT_TYPE(SSL_VERSION_FALLBACK)
 
+// An SSL connection needs to be retried with more cipher suites because the
+// server may require a deprecated cipher suite. The following parameters are
+// attached to the event:
+//   {
+//     "host_and_port": <String encoding the host and port>,
+//     "net_error": <Net integer error code>,
+//   }
+EVENT_TYPE(SSL_CIPHER_FALLBACK)
+
 // We found that our prediction of the server's certificates was correct and
 // we merged the verification with the SSLHostInfo. (Note: now obsolete.)
 EVENT_TYPE(SSL_VERIFICATION_MERGED)