Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/stats.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_DISK_CACHE_STATS_H_
-#define NET_DISK_CACHE_STATS_H_
+#ifndef NET_DISK_CACHE_BLOCKFILE_STATS_H_
+#define NET_DISK_CACHE_BLOCKFILE_STATS_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
-#include "net/disk_cache/addr.h"
-#include "net/disk_cache/stats_histogram.h"
+#include "net/disk_cache/blockfile/addr.h"
+#include "net/disk_cache/blockfile/stats_histogram.h"
 
 namespace base {
 class HistogramSamples;
 }  // namespace base
 
 namespace disk_cache {
 
 typedef std::vector<std::pair<std::string, std::string> > StatsItems;
 
 // This class stores cache-specific usage information, for tunning purposes.
@@ skipping 71 matching lines @@
   Addr storage_addr_;
   int data_sizes_[kDataSizesLength];
   int64 counters_[MAX_COUNTER];
   StatsHistogram* size_histogram_;
 
   DISALLOW_COPY_AND_ASSIGN(Stats);
 };
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_STATS_H_
+#endif  // NET_DISK_CACHE_BLOCKFILE_STATS_H_