Migrate chrome/browser files to histogram_macros.h includes.

chrome/browser/extensions/api/metrics_private/metrics_private_api.cc

 // 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 "chrome/browser/extensions/api/metrics_private/metrics_private_api.h"
 
 #include <limits.h>
 
 #include <algorithm>
 
 #include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
 #include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
 #include "chrome/common/extensions/api/metrics_private.h"
 #include "components/variations/variations_associated_data.h"
 #include "content/public/browser/user_metrics.h"
 #include "extensions/common/extension.h"
 
 namespace extensions {
 
 namespace GetIsCrashReportingEnabled =
@@ skipping 182 matching lines @@
   std::unique_ptr<RecordLongTime::Params> params(
       RecordLongTime::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
   static const int kOneHourMs = 60 * 60 * 1000;
   RecordValue(params->metric_name, base::HISTOGRAM, 1, kOneHourMs, 50,
               params->value);
   return RespondNow(NoArguments());
 }
 
 } // namespace extensions