Cleanup: Remove unneeded forward declarations from remoting.

remoting/protocol/session_manager.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.
 
 // The purpose of SessionManager is to facilitate creation of chromotocol
 // sessions. Both host and client use it to establish chromotocol
 // sessions. JingleChromotocolServer implements this inteface using
 // libjingle.
 //
 // OUTGOING SESSIONS
@@ skipping 34 matching lines @@
 #ifndef REMOTING_PROTOCOL_SESSION_MANAGER_H_
 #define REMOTING_PROTOCOL_SESSION_MANAGER_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/non_thread_safe.h"
 #include "remoting/protocol/session.h"
 
-class Task;
-
 namespace crypto {
 class RSAPrivateKey;
 }  // namespace base
 
 namespace remoting {
 
 class SignalStrategy;
 
 namespace protocol {
 
@@ skipping 76 matching lines @@
   virtual void Close() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SessionManager);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_SESSION_MANAGER_H_