Reorganize net/disk_cache into backend specific directories.

net/disk_cache/v2/mapped_file.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.
 
 // See net/disk_cache/disk_cache.h for the public interface of the cache.
 
-#ifndef NET_DISK_CACHE_MAPPED_FILE_H_
-#define NET_DISK_CACHE_MAPPED_FILE_H_
+#ifndef NET_DISK_CACHE_V2_MAPPED_FILE_H_
+#define NET_DISK_CACHE_V2_MAPPED_FILE_H_
 
 #include "net/base/net_export.h"
-#include "net/disk_cache/file.h"
-#include "net/disk_cache/file_block.h"
+#include "net/disk_cache/v2/file.h"
+#include "net/disk_cache/v2/file_block.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace disk_cache {
 
 // This class implements a memory mapped file used to access block-files. The
 // idea is that the header and bitmap will be memory mapped all the time, and
 // the actual data for the blocks will be access asynchronously (most of the
@@ skipping 45 matching lines @@
   explicit ScopedFlush(MappedFile* file) : file_(file) {}
   ~ScopedFlush() {
     file_->Flush();
   }
  private:
   MappedFile* file_;
 };
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_MAPPED_FILE_H_
+#endif  // NET_DISK_CACHE_V2_MAPPED_FILE_H_