Cleanup: Remove unneeded forward declararations in net.

net/dns/watching_file_reader.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_DNS_WATCHING_FILE_READER_H_
 #define NET_DNS_WATCHING_FILE_READER_H_
 #pragma once
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path_watcher.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "net/base/net_export.h"
 #include "net/dns/serial_worker.h"
 
-// Forward declaration
-namespace base {
-class MessageLoopProxy;
-}
-
 namespace net {
 
 // Allows mocking FilePathWatcher
 class NET_EXPORT_PRIVATE FilePathWatcherShim
   : NON_EXPORTED_BASE(public base::NonThreadSafe) {
  public:
   FilePathWatcherShim();
   virtual ~FilePathWatcherShim();
   virtual bool Watch(
       const FilePath& path,
@@ skipping 52 matching lines @@
   scoped_ptr<FilePathWatcherShim> watcher_;
   scoped_refptr<WatcherDelegate> watcher_delegate_;
   scoped_refptr<SerialWorker> reader_;
 
   DISALLOW_COPY_AND_ASSIGN(WatchingFileReader);
 };
 
 }  // namespace net
 
 #endif  // NET_DNS_WATCHING_FILE_READER_H_
-