Move FileEnumerator to its own file, do some refactoring.

net/base/directory_lister.h

 // Copyright (c) 2012 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_BASE_DIRECTORY_LISTER_H_
 #define NET_BASE_DIRECTORY_LISTER_H_
 
 #include <vector>
 
-#include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop_proxy.h"
 #include "net/base/net_export.h"
 
 namespace net {
 
 //
 // This class provides an API for listing the contents of a directory on the
 // filesystem asynchronously.  It spawns a background thread, and enumerates
 // the specified directory on that thread.  It marshalls WIN32_FIND_DATA
 // structs over to the main application thread.  The consumer of this class
 // is insulated from any of the multi-threading details.
 //
 class NET_EXPORT DirectoryLister  {
  public:
   // Represents one file found.
   struct DirectoryListerData {
-    file_util::FileEnumerator::FindInfo info;
+    base::FileEnumerator::FileInfo info;
     base::FilePath path;
   };
 
   // Implement this class to receive directory entries.
   class DirectoryListerDelegate {
    public:
     // Called for each file found by the lister.
     virtual void OnListFile(const DirectoryListerData& data) = 0;
 
     // Called when the listing is complete.
@@ skipping 74 matching lines @@
 
   const scoped_refptr<Core> core_;
   DirectoryListerDelegate* const delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryLister);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_DIRECTORY_LISTER_H_