Refactor the daemon controller so that the callbacks are called on the caller thread.

remoting/host/setup/native_messaging_host.h

Index: remoting/host/setup/native_messaging_host.h
diff --git a/remoting/host/setup/native_messaging_host.h b/remoting/host/setup/native_messaging_host.h
index 986bbf91b67ab73436c3394a1d598cf1fdae0f96..eb7250a669664b14a9d648ca52cba09a295930ff 100644
--- a/remoting/host/setup/native_messaging_host.h
+++ b/remoting/host/setup/native_messaging_host.h
@@ -36,7 +36,7 @@ class PairingRegistry;
 class NativeMessagingHost {
  public:
   NativeMessagingHost(
-      scoped_ptr<DaemonController> daemon_controller,
+      scoped_refptr<DaemonController> daemon_controller,
       scoped_refptr<protocol::PairingRegistry> pairing_registry,
       scoped_ptr<OAuthClient> oauth_client,
       base::PlatformFile input,
@@ -104,10 +104,9 @@ class NativeMessagingHost {
                           scoped_ptr<base::DictionaryValue> config);
   void SendPairedClientsResponse(scoped_ptr<base::DictionaryValue> response,
                                  scoped_ptr<base::ListValue> pairings);
-  void SendUsageStatsConsentResponse(scoped_ptr<base::DictionaryValue> response,
-                                     bool supported,
-                                     bool allowed,
-                                     bool set_by_policy);
+  void SendUsageStatsConsentResponse(
+      scoped_ptr<base::DictionaryValue> response,
+      const DaemonController::UsageStatsConsent& consent);
   void SendAsyncResult(scoped_ptr<base::DictionaryValue> response,
                        DaemonController::AsyncResult result);
   void SendBooleanResult(scoped_ptr<base::DictionaryValue> response,
@@ -130,7 +129,7 @@ class NativeMessagingHost {
   // The DaemonController may post tasks to this object during destruction (but
   // not afterwards), so it needs to be destroyed before other members of this
   // class (except for |weak_factory_|).
-  scoped_ptr<remoting::DaemonController> daemon_controller_;
+  scoped_refptr<remoting::DaemonController> daemon_controller_;
 
   // Used to load and update the paired clients for this host.
   scoped_refptr<protocol::PairingRegistry> pairing_registry_;