Reduce header dependencies in net/

net/base/file_stream.h

 // Copyright (c) 2008 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.
 
 // This file defines FileStream, a basic interface for reading and writing files
 // synchronously or asynchronously with support for seeking to an offset.
 // Note that even when used asynchronously, only one operation is supported at
 // a time.
 
 #ifndef NET_BASE_FILE_STREAM_H_
 #define NET_BASE_FILE_STREAM_H_
 
-#include "base/file_path.h"
 #include "base/platform_file.h"
 #include "base/scoped_ptr.h"
 #include "net/base/completion_callback.h"
 
+class FilePath;
+
 namespace net {
 
 // TODO(darin): Move this to a more generic location.
 // This explicit mapping matches both FILE_ on Windows and SEEK_ on Linux.
 enum Whence {
   FROM_BEGIN   = 0,
   FROM_CURRENT = 1,
   FROM_END     = 2
 };
 
@@ skipping 99 matching lines @@
 
   base::PlatformFile file_;
   int open_flags_;
 
   DISALLOW_COPY_AND_ASSIGN(FileStream);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_FILE_STREAM_H_