Reorganize net/disk_cache into backend specific directories.

net/disk_cache/v2/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_FILE_H_
-#define NET_DISK_CACHE_FILE_H_
+#ifndef NET_DISK_CACHE_V2_FILE_H_
+#define NET_DISK_CACHE_V2_FILE_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/platform_file.h"
 #include "net/base/net_export.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace disk_cache {
@@ skipping 71 matching lines @@
   bool init_;
   bool mixed_;
   base::PlatformFile platform_file_;  // Regular, asynchronous IO handle.
   base::PlatformFile sync_platform_file_;  // Synchronous IO handle.
 
   DISALLOW_COPY_AND_ASSIGN(File);
 };
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_FILE_H_
+#endif  // NET_DISK_CACHE_V2_FILE_H_