Change includes of histogram.h to histogram_macros.h.

components/memory_pressure/memory_pressure_stats_collector.cc

 // Copyright 2015 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/memory_pressure/memory_pressure_stats_collector.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/macros.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/time/tick_clock.h"
 
 namespace memory_pressure {
 
 namespace {
 
 using MemoryPressureLevel = MemoryPressureListener::MemoryPressureLevel;
 
 // Converts a memory pressure level to an UMA enumeration value.
 MemoryPressureLevelUMA MemoryPressureLevelToUmaEnumValue(
@@ skipping 127 matching lines @@
 void MemoryPressureStatsCollector::ReportLevelChange(
     MemoryPressureLevel old_pressure_level,
     MemoryPressureLevel new_pressure_level) {
   UMA_HISTOGRAM_ENUMERATION("Memory.PressureLevelChange",
                             MemoryPressureLevelChangeToUmaEnumValue(
                                 old_pressure_level, new_pressure_level),
                             UMA_MEMORY_PRESSURE_LEVEL_CHANGE_COUNT);
 }
 
 }  // namespace memory_pressure