Refactored PairingRegistry::Delegate such that it can retrieve/modify for a single client.

remoting/host/remoting_me2me_host.cc

Index: remoting/host/remoting_me2me_host.cc
diff --git a/remoting/host/remoting_me2me_host.cc b/remoting/host/remoting_me2me_host.cc
index 3af312364861ee8e1c456dcc9d0071d7fdcc6059..af8861bdff8aa122a717e04a5d4273309d9b5a18 100644
--- a/remoting/host/remoting_me2me_host.cc
+++ b/remoting/host/remoting_me2me_host.cc
@@ -482,12 +482,8 @@ void HostProcess::CreateAuthenticatorFactory() {
     return;
   }
 
-  scoped_refptr<protocol::PairingRegistry> pairing_registry = NULL;
-  scoped_ptr<protocol::PairingRegistry::Delegate> delegate(
-      CreatePairingRegistryDelegate(context_->file_task_runner()));
-  if (delegate) {
-    pairing_registry = new protocol::PairingRegistry(delegate.Pass());
-  }
+  scoped_refptr<protocol::PairingRegistry> pairing_registry =
+      CreatePairingRegistry(context_->file_task_runner());
 
   scoped_ptr<protocol::AuthenticatorFactory> factory;