Disk cache: Remove stats_histogram.

net/disk_cache/blockfile/stats_histogram.cc

Index: net/disk_cache/blockfile/stats_histogram.cc
diff --git a/net/disk_cache/blockfile/stats_histogram.cc b/net/disk_cache/blockfile/stats_histogram.cc
deleted file mode 100644
index a95eb46f4373e5334a8a274bd50b2dffac482250..0000000000000000000000000000000000000000
--- a/net/disk_cache/blockfile/stats_histogram.cc
+++ /dev/null
@@ -1,94 +0,0 @@
-// 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.
-
-#include "net/disk_cache/blockfile/stats_histogram.h"
-
-#include "base/debug/leak_annotations.h"
-#include "base/logging.h"
-#include "base/metrics/bucket_ranges.h"
-#include "base/metrics/histogram_base.h"
-#include "base/metrics/sample_vector.h"
-#include "base/metrics/statistics_recorder.h"
-#include "net/disk_cache/blockfile/stats.h"
-
-namespace disk_cache {
-
-using base::BucketRanges;
-using base::Histogram;
-using base::HistogramSamples;
-using base::SampleVector;
-using base::StatisticsRecorder;
-
-StatsHistogram::StatsHistogram(const std::string& name,
-                               Sample minimum,
-                               Sample maximum,
-                               const BucketRanges* ranges,
-                               const Stats* stats)
-    : Histogram(name, minimum, maximum, ranges),
-      stats_(stats) {}
-
-StatsHistogram::~StatsHistogram() {}
-
-// static
-void StatsHistogram::InitializeBucketRanges(const Stats* stats,
-                                            BucketRanges* ranges) {
-  for (size_t i = 0; i < ranges->size(); ++i) {
-    ranges->set_range(i, stats->GetBucketRange(i));
-  }
-  ranges->ResetChecksum();
-}
-
-StatsHistogram* StatsHistogram::FactoryGet(const std::string& name,
-                                           const Stats* stats) {
-  Sample minimum = 1;
-  Sample maximum = disk_cache::Stats::kDataSizesLength - 1;
-  size_t bucket_count = disk_cache::Stats::kDataSizesLength;
-  HistogramBase* histogram = StatisticsRecorder::FindHistogram(name);
-  if (!histogram) {
-    DCHECK(stats);
-
-    // To avoid racy destruction at shutdown, the following will be leaked.
-    BucketRanges* ranges = new BucketRanges(bucket_count + 1);
-    InitializeBucketRanges(stats, ranges);
-    const BucketRanges* registered_ranges =
-        StatisticsRecorder::RegisterOrDeleteDuplicateRanges(ranges);
-
-    // To avoid racy destruction at shutdown, the following will be leaked.
-    StatsHistogram* stats_histogram =
-        new StatsHistogram(name, minimum, maximum, registered_ranges, stats);
-    stats_histogram->SetFlags(kUmaTargetedHistogramFlag);
-    histogram = StatisticsRecorder::RegisterOrDeleteDuplicate(stats_histogram);
-  }
-
-  DCHECK(base::HISTOGRAM == histogram->GetHistogramType());
-  DCHECK(histogram->HasConstructionArguments(minimum, maximum, bucket_count));
-
-  // We're preparing for an otherwise unsafe upcast by ensuring we have the
-  // proper class type.
-  StatsHistogram* return_histogram = static_cast<StatsHistogram*>(histogram);
-  return return_histogram;
-}
-
-void StatsHistogram::Disable() {
-  stats_ = NULL;
-}
-
-scoped_ptr<HistogramSamples> StatsHistogram::SnapshotSamples() const {
-  scoped_ptr<SampleVector> samples(new SampleVector(bucket_ranges()));
-  if (stats_)
-     stats_->Snapshot(samples.get());
-
-  // Only report UMA data once.
-  StatsHistogram* mutable_me = const_cast<StatsHistogram*>(this);
-  mutable_me->ClearFlags(kUmaTargetedHistogramFlag);
-
-  return samples.PassAs<HistogramSamples>();
-}
-
-int StatsHistogram::FindCorruption(const HistogramSamples& samples) const {
-  // This class won't monitor inconsistencies.
-  return HistogramBase::NO_INCONSISTENCIES;
-}
-
-}  // namespace disk_cache