Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/histogram_macros_v3.h

 // Copyright 2014 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.
 
 // This file contains macros to simplify histogram reporting from the disk
 // cache. The main issue is that we want to have separate histograms for each
 // type of cache (regular vs. media, etc), without adding the complexity of
 // keeping track of a potentially large number of histogram objects that have to
 // survive the backend object that created them.
 
-#ifndef NET_DISK_CACHE_V3_HISTOGRAM_MACROS_H_
-#define NET_DISK_CACHE_V3_HISTOGRAM_MACROS_H_
+#ifndef NET_DISK_CACHE_BLOCKFILE_HISTOGRAM_MACROS_V3_H_
+#define NET_DISK_CACHE_BLOCKFILE_HISTOGRAM_MACROS_V3_H_
 
 // -----------------------------------------------------------------------------
 
 // These histograms follow the definition of UMA_HISTOGRAMN_XXX except that
 // whenever the name changes (the experiment group changes), the histrogram
 // object is re-created.
 // Note: These macros are only run on one thread, so the declarations of
 // |counter| was made static (i.e., there will be no race for reinitialization).
 
 #define CACHE_HISTOGRAM_CUSTOM_COUNTS(name, sample, min, max, bucket_count) \
@@ skipping 86 matching lines @@
         CACHE_HISTOGRAM_##type(my_name.data(), sample);\
         break;\
       case net::PNACL_CACHE:\
         CACHE_HISTOGRAM_##type(my_name.data(), sample);\
         break;\
       default:\
         break;\
     }\
   }
 
-#endif  // NET_DISK_CACHE_V3_HISTOGRAM_MACROS_H_
+#endif  // NET_DISK_CACHE_BLOCKFILE_HISTOGRAM_MACROS_V3_H_