Cleanup: Remove unneeded forward declarations from remoting.

remoting/host/support_access_verifier.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.
 
 #ifndef REMOTING_HOST_SUPPORT_ACCESS_VERIFIER_H_
 #define REMOTING_HOST_SUPPORT_ACCESS_VERIFIER_H_
 
 #include <string>
 
 #include "remoting/host/access_verifier.h"
 
 #include "base/compiler_specific.h"
 
 namespace remoting {
 
-class HostConfig;
-
 // SupportAccessVerifier is used in Me2Mom scenario to verify that the
 // client knows the host secret.
 class SupportAccessVerifier : public AccessVerifier {
  public:
   SupportAccessVerifier();
   virtual ~SupportAccessVerifier();
 
   const std::string& host_secret() const { return host_secret_; }
 
   // AccessVerifier interface.
   virtual bool VerifyPermissions(
       const std::string& client_jid,
       const std::string& encoded_client_token) OVERRIDE;
 
   void OnIT2MeHostRegistered(bool successful, const std::string& support_id);
 
  private:
   std::string host_secret_;
   std::string support_id_;
 
   DISALLOW_COPY_AND_ASSIGN(SupportAccessVerifier);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_SUPPORT_ACCESS_VERIFIER_H_