Remove unneeded enum forward declarations

content/browser/renderer_host/pepper/pepper_tcp_socket_message_filter.h

 // Copyright 2013 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 CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_TCP_SOCKET_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_TCP_SOCKET_MESSAGE_FILTER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 17 matching lines @@
 #include "ppapi/c/private/ppb_net_address_private.h"
 #include "ppapi/host/resource_message_filter.h"
 #include "ppapi/shared_impl/ppb_tcp_socket_shared.h"
 
 #if defined(OS_CHROMEOS)
 #include "chromeos/network/firewall_hole.h"
 #include "content/public/browser/browser_thread.h"
 #endif  // defined(OS_CHROMEOS)
 
 namespace net {
-enum AddressFamily;
 class DrainableIOBuffer;
 class IOBuffer;
 class SSLClientSocket;
 }
 
 namespace ppapi {
 class SocketOptionData;
 
 namespace host {
 struct ReplyMessageContext;
@@ skipping 215 matching lines @@
   int pending_read_net_result_;
 
   const bool is_potentially_secure_plugin_context_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperTCPSocketMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_TCP_SOCKET_MESSAGE_FILTER_H_