Cleanup: Remove unneeded forward declararations in net.

net/base/network_delegate.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 NET_BASE_NETWORK_DELEGATE_H_
 #define NET_BASE_NETWORK_DELEGATE_H_
 #pragma once
 
 #include "base/callback.h"
 #include "base/string16.h"
 #include "base/threading/non_thread_safe.h"
 #include "net/base/auth.h"
 #include "net/base/completion_callback.h"
 
 class GURL;
 
 namespace net {
 
 // NOTE: Layering violations!
 // We decided to accept these violations (depending
 // on other net/ submodules from net/base/), because otherwise NetworkDelegate
 // would have to be broken up into too many smaller interfaces targeted to each
 // submodule. Also, since the lower levels in net/ may callback into higher
 // levels, we may encounter dangerous casting issues.
 //
 // NOTE: It is not okay to add any compile-time dependencies on symbols outside
 // of net/base here, because we have a net_base library. Forward declarations
 // are ok.
-class HostPortPair;
 class HttpRequestHeaders;
 class HttpResponseHeaders;
 class URLRequest;
 
 class NetworkDelegate : public base::NonThreadSafe {
  public:
   // AuthRequiredResponse indicates how a NetworkDelegate handles an
   // OnAuthRequired call. It's placed in this file to prevent url_request.h
   // from having to include network_delegate.h.
   enum AuthRequiredResponse {
@@ skipping 119 matching lines @@
   virtual AuthRequiredResponse OnAuthRequired(
       URLRequest* request,
       const AuthChallengeInfo& auth_info,
       const AuthCallback& callback,
       AuthCredentials* credentials) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NETWORK_DELEGATE_H_