Move code in src/remoting to the new callbacks.

remoting/client/chromoting_client.h

Index: remoting/client/chromoting_client.h
diff --git a/remoting/client/chromoting_client.h b/remoting/client/chromoting_client.h
index 124e42594c21680c453a7f41450d01d00ddf00b1..c165c4ee040e7163c2ac4b6ffba97badf1838964 100644
--- a/remoting/client/chromoting_client.h
+++ b/remoting/client/chromoting_client.h
@@ -9,7 +9,7 @@
 
 #include <list>
 
-#include "base/task.h"
+#include "base/callback.h"
 #include "base/time.h"
 #include "remoting/base/scoped_thread_proxy.h"
 #include "remoting/client/client_config.h"
@@ -46,7 +46,7 @@ class ChromotingClient : public protocol::ConnectionToHost::HostEventCallback,
                    ChromotingView* view,
                    RectangleUpdateDecoder* rectangle_decoder,
                    InputHandler* input_handler,
-                   Task* client_done);
+                   const base::Closure& client_done);
   virtual ~ChromotingClient();
 
   void Start(scoped_refptr<XmppProxy> xmpp_proxy);
@@ -102,7 +102,7 @@ class ChromotingClient : public protocol::ConnectionToHost::HostEventCallback,
   InputHandler* input_handler_;
 
   // If non-NULL, this is called when the client is done.
-  Task* client_done_;
+  base::Closure client_done_;
 
   // Contains all video packets that have been received, but have not yet been
   // processed.