Migrate content/ files to histogram_macros.h includes.

content/browser/power_usage_monitor_impl.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 "content/browser/power_usage_monitor_impl.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/macros.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/stringprintf.h"
 #include "base/sys_info.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/power_usage_monitor.h"
 #include "content/public/browser/render_process_host.h"
 
 namespace content {
@@ skipping 244 matching lines @@
   RenderProcessHost* rph = Source<RenderProcessHost>(source).ptr();
   OnRenderProcessNotification(type, rph->GetID());
 }
 
 void PowerUsageMonitor::CancelPendingHistogramReporting() {
   // Cancel any in-progress histogram reports and reporting of discharge UMA.
   system_interface_->CancelPendingHistogramReports();
 }
 
 }  // namespace content