Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/disk_format_base.h

 // Copyright (c) 2011 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.
 
 // For a general description of the files used by the cache see file_format.h.
 //
 // A block file is a file designed to store blocks of data of a given size. It
 // is able to store data that spans from one to four consecutive "blocks", and
 // it grows as needed to store up to approximately 65000 blocks. It has a fixed
 // size header used for book keeping such as tracking free of blocks on the
 // file. For example, a block-file for 1KB blocks will grow from 8KB when
 // totally empty to about 64MB when completely full. At that point, data blocks
 // of 1KB will be stored on a second block file that will store the next set of
 // 65000 blocks. The first file contains the number of the second file, and the
 // second file contains the number of a third file, created when the second file
 // reaches its limit. It is important to remember that no matter how long the
 // chain of files is, any given block can be located directly by its address,
 // which contains the file number and starting block inside the file.
 
-#ifndef NET_DISK_CACHE_DISK_FORMAT_BASE_H_
-#define NET_DISK_CACHE_DISK_FORMAT_BASE_H_
+#ifndef NET_DISK_CACHE_BLOCKFILE_DISK_FORMAT_BASE_H_
+#define NET_DISK_CACHE_BLOCKFILE_DISK_FORMAT_BASE_H_
 
 #include "base/basictypes.h"
 #include "net/base/net_export.h"
 
 namespace disk_cache {
 
 typedef uint32 CacheAddr;
 
 const uint32 kBlockVersion2 = 0x20000;  // Version 2.0.
 const uint32 kBlockCurrentVersion = 0x30000;  // Version 3.0.
@@ skipping 90 matching lines @@
                             // and as large as 8 KB.
 };
 
 // The number of blocks stored by a child entry.
 const int kNumSparseBits = 1024;
 COMPILE_ASSERT(sizeof(SparseData) == sizeof(SparseHeader) + kNumSparseBits / 8,
                Invalid_SparseData_bitmap);
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_DISK_FORMAT_BASE_H_
+#endif  // NET_DISK_CACHE_BLOCKFILE_DISK_FORMAT_BASE_H_