Migrate chrome/browser files to histogram_macros.h includes.

chrome/browser/performance_monitor/process_metrics_history.cc

 // Copyright 2013 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/performance_monitor/process_metrics_history.h"
 
 #include <limits>
 
 #include "base/logging.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/process/process_metrics.h"
 #include "build/build_config.h"
 #include "content/public/common/process_type.h"
 
 #if defined(OS_MACOSX)
 #include "content/public/browser/browser_child_process_host.h"
 #endif
 
 namespace performance_monitor {
 
@@ skipping 144 matching lines @@
 
   if (cpu_usage_ > kHighCPUUtilizationThreshold &&
       trace_trigger_handle_ != -1) {
     content::BackgroundTracingManager::GetInstance()->TriggerNamedEvent(
         trace_trigger_handle_,
         content::BackgroundTracingManager::StartedFinalizingCallback());
   }
 }
 
 }  // namespace performance_monitor