Change includes of histogram.h to histogram_macros.h.

components/user_prefs/tracked/tracked_preference_helper.cc

 // 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.
 
 #include "components/user_prefs/tracked/tracked_preference_helper.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "components/user_prefs/tracked/tracked_preference_histogram_names.h"
 
 TrackedPreferenceHelper::TrackedPreferenceHelper(
     const std::string& pref_path,
     size_t reporting_id,
     size_t reporting_ids_count,
     PrefHashFilter::EnforcementLevel enforcement_level,
     PrefHashFilter::ValueType value_type)
     : pref_path_(pref_path),
       reporting_id_(reporting_id),
@@ skipping 95 matching lines @@
     size_t count) const {
   // The histogram below is an expansion of the UMA_HISTOGRAM_COUNTS_100 macro
   // adapted to allow for a dynamically suffixed histogram name.
   // Note: The factory creates and owns the histogram.
   base::HistogramBase* histogram = base::LinearHistogram::FactoryGet(
       user_prefs::tracked::kTrackedSplitPrefHistogramChanged + pref_path_, 1,
       100,  // Allow counts up to 100.
       101, base::HistogramBase::kUmaTargetedHistogramFlag);
   histogram->Add(count);
 }