[GCM] Adding a list of accounts present on the client to checkin request

google_apis/gcm/tools/mcs_probe.cc

Index: google_apis/gcm/tools/mcs_probe.cc
diff --git a/google_apis/gcm/tools/mcs_probe.cc b/google_apis/gcm/tools/mcs_probe.cc
index 28e6fd311dccf7c49b9a0d9e51a3eaa28e6fbb81..1d8c65fbb53ebdaa4618b46020d7e69c4da0083a 100644
--- a/google_apis/gcm/tools/mcs_probe.cc
+++ b/google_apis/gcm/tools/mcs_probe.cc
@@ -8,6 +8,7 @@
 #include <cstddef>
 #include <cstdio>
 #include <string>
+#include <vector>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
@@ -425,6 +426,7 @@ void MCSProbe::CheckIn() {
       chrome_build_proto,
       0,
       0,
+      std::vector<std::string>(),
       url_request_context_getter_.get()));
   checkin_request_->Start();
 }