Use lower-case JIDs when generating signatures for messages sent to CRD bot.

remoting/host/register_support_host_request.cc

Index: remoting/host/register_support_host_request.cc
diff --git a/remoting/host/register_support_host_request.cc b/remoting/host/register_support_host_request.cc
index b1bdd418c10298c6bbfffe780c2a7680fdf369f1..6d398734049b9954b3b76ba15d4a43532b71ca70 100644
--- a/remoting/host/register_support_host_request.cc
+++ b/remoting/host/register_support_host_request.cc
@@ -13,6 +13,7 @@
 #include "remoting/base/constants.h"
 #include "remoting/host/host_config.h"
 #include "remoting/signaling/iq_sender.h"
+#include "remoting/signaling/jid_util.h"
 #include "remoting/signaling/signal_strategy.h"
 #include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
 #include "third_party/webrtc/libjingle/xmpp/constants.h"
@@ -98,7 +99,7 @@ scoped_ptr<XmlElement> RegisterSupportHostRequest::CreateSignature(
   signature_tag->AddAttr(
       QName(kChromotingXmlNamespace, kSignatureTimeAttr), time_str);
 
-  std::string message = jid + ' ' + time_str;
+  std::string message = NormalizeJid(jid) + ' ' + time_str;
   std::string signature(key_pair_->SignMessage(message));
   signature_tag->AddText(signature);