third_party/mdns: clean up README.google

  clean up README.google since these changes have been pushed to github.

Change-Id: I80375fc902f84a39e40c950aa9f32343c2beb202
diff --git a/go/src/github.com/presotto/go-mdns-sd/README.google b/go/src/github.com/presotto/go-mdns-sd/README.google
index 004647a..c6f348e 100644
--- a/go/src/github.com/presotto/go-mdns-sd/README.google
+++ b/go/src/github.com/presotto/go-mdns-sd/README.google
@@ -7,7 +7,4 @@
 A standalone go based mdns and service discovery implementation
 
 Local Modifications:
- - added a function for removing registered services.
- - changed to support multiple watchers for a same service.
- - changed to not announce host addresses when service port is zero.
- - fixed data races.
+None