Move dir_reader to base/files

base/files/dir_reader_linux.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 BASE_DIR_READER_LINUX_H_
-#define BASE_DIR_READER_LINUX_H_
+#ifndef BASE_FILES_DIR_READER_LINUX_H_
+#define BASE_FILES_DIR_READER_LINUX_H_
 #pragma once
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stdint.h>
 #include <sys/syscall.h>
 #include <unistd.h>
 
 #include "base/logging.h"
 #include "base/eintr_wrapper.h"
@@ skipping 72 matching lines @@
  private:
   const int fd_;
   unsigned char buf_[512];
   size_t offset_, size_;
 
   DISALLOW_COPY_AND_ASSIGN(DirReaderLinux);
 };
 
 }  // namespace base
 
-#endif // BASE_DIR_READER_LINUX_H_
+#endif // BASE_FILES_DIR_READER_LINUX_H_