net: Cleanup class/struct forward declarations

net/proxy/proxy_service_mojo.h

 // Copyright 2015 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_PROXY_PROXY_SERVICE_MOJO_H_
 #define NET_PROXY_PROXY_SERVICE_MOJO_H_
 
 #include <memory>
 
 #include "net/proxy/dhcp_proxy_script_fetcher.h"
 
 namespace net {
-namespace interfaces {
-class ProxyResolverFactory;
-}
 
 class HostResolver;
 class MojoProxyResolverFactory;
 class NetLog;
 class NetworkDelegate;
 class ProxyConfigService;
 class ProxyScriptFetcher;
 class ProxyService;
 
 // Creates a proxy service that uses |mojo_proxy_factory| to create and connect
@@ skipping 30 matching lines @@
     std::unique_ptr<ProxyConfigService> proxy_config_service,
     ProxyScriptFetcher* proxy_script_fetcher,
     std::unique_ptr<DhcpProxyScriptFetcher> dhcp_proxy_script_fetcher,
     HostResolver* host_resolver,
     NetLog* net_log,
     NetworkDelegate* network_delegate);
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_SERVICE_MOJO_H_