Refactor SignalStrategy so that it can be reused for multiple connections.

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 5974675de7c512ad40d6797386a80c1a04f7cd54..5668f278d793c88711a7b6107aa3e736be191cd0 100644
--- a/remoting/host/register_support_host_request.cc
+++ b/remoting/host/register_support_host_request.cc
@@ -53,15 +53,15 @@ bool RegisterSupportHostRequest::Init(HostConfig* config,
 }
 
 void RegisterSupportHostRequest::OnSignallingConnected(
-    SignalStrategy* signal_strategy,
-    const std::string& jid) {
+    SignalStrategy* signal_strategy) {
   DCHECK(!callback_.is_null());
 
   message_loop_ = MessageLoop::current();
 
   iq_sender_.reset(new IqSender(signal_strategy));
   request_.reset(iq_sender_->SendIq(
-      buzz::STR_SET, kChromotingBotJid, CreateRegistrationRequest(jid),
+      buzz::STR_SET, kChromotingBotJid,
+      CreateRegistrationRequest(signal_strategy->GetLocalJid()),
       base::Bind(&RegisterSupportHostRequest::ProcessResponse,
                  base::Unretained(this))));
 }