Switch remoting/protocol to new callbacks

remoting/protocol/host_control_sender.h

Index: remoting/protocol/host_control_sender.h
diff --git a/remoting/protocol/host_control_sender.h b/remoting/protocol/host_control_sender.h
index c1425daf786f48fc305f4e2847aef0ed8c4cf895..b1e15b4189024ebbb40777a9e1905a01ae4136d2 100644
--- a/remoting/protocol/host_control_sender.h
+++ b/remoting/protocol/host_control_sender.h
@@ -13,11 +13,10 @@
 #define REMOTING_PROTOCOL_HOST_STUB_IMPL_H_
 
 #include "base/basictypes.h"
+#include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "remoting/protocol/host_stub.h"
 
-class Task;
-
 namespace base {
 class MessageLoopProxy;
 }  // namespace base
@@ -41,7 +40,7 @@ class HostControlSender : public HostStub {
   virtual ~HostControlSender();
 
   virtual void BeginSessionRequest(
-      const LocalLoginCredentials* credentials, Task* done);
+      const LocalLoginCredentials* credentials, const base::Closure& done);
 
   // Stop writing. Must be called on the network thread when the
   // underlying socket is being destroyed.