remoting: Cleanup class/struct fwd declarations

remoting/test/host_list_fetcher.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 REMOTING_TEST_HOST_LIST_FETCHER_H_
 #define REMOTING_TEST_HOST_LIST_FETCHER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "remoting/test/host_info.h"
 
-namespace net {
-class UrlFetcher;
-}
 namespace remoting {
 class URLRequestContextGetter;
 }
 
 namespace remoting {
 namespace test {
 
 // Used by the HostlistFetcher to make HTTP requests and also by the
 // unittests for this class to set fake response data for these URLs.
 const char kHostListProdRequestUrl[] = "https://www.googleapis.com/"
@@ skipping 35 matching lines @@
   // Caller-supplied callback used to return hostlist on success.
   HostlistCallback hostlist_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(HostListFetcher);
 };
 
 }  // namespace test
 }  // namespace remoting
 
 #endif  // REMOTING_TEST_HOST_LIST_FETCHER_H_