Switch remoting/protocol to new callbacks

remoting/protocol/host_stub.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Interface of a host that receives commands from a Chromoting client.
 //
 // This interface handles control messages defined in control.proto.
 
 #ifndef REMOTING_PROTOCOL_HOST_STUB_H_
 #define REMOTING_PROTOCOL_HOST_STUB_H_
 
 #include "base/basictypes.h"
 
 class Task;
 
 namespace remoting {
 namespace protocol {
 
 class LocalLoginCredentials;
 
 class HostStub {
  public:
   HostStub() {};
   virtual ~HostStub() {};
 
   virtual void BeginSessionRequest(
-      const LocalLoginCredentials* credentials, Task* done) = 0;
+      const LocalLoginCredentials* credentials, const base::Closure& done) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HostStub);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_HOST_STUB_H_