Disk cache: Remove stats_histogram.

net/disk_cache/blockfile/histogram_macros.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.
 
 // 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_BLOCKFILE_HISTOGRAM_MACROS_H_
 #define NET_DISK_CACHE_BLOCKFILE_HISTOGRAM_MACROS_H_
 
+#include "base/metrics/histogram.h"
+
 // -----------------------------------------------------------------------------
 
 // These histograms follow the definition of UMA_HISTOGRAMN_XXX except that
 // the counter is not cached locally.
 
 #define CACHE_HISTOGRAM_CUSTOM_COUNTS(name, sample, min, max, bucket_count) \
     do { \
       base::HistogramBase* counter = base::Histogram::FactoryGet( \
             name, min, max, bucket_count, \
             base::Histogram::kUmaTargetedHistogramFlag); \
@@ skipping 72 matching lines @@
       case net::MEDIA_CACHE:\
       case net::APP_CACHE:\
       case net::SHADER_CACHE:\
       case net::PNACL_CACHE:\
         CACHE_HISTOGRAM_##type(my_name.data(), sample);\
         break;\
     }\
   }
 
 #endif  // NET_DISK_CACHE_BLOCKFILE_HISTOGRAM_MACROS_H_