Enable UMA histogram logger for low memor kill events in ArcMetricsService.

components/arc/metrics/arc_low_memory_killer_monitor.h

 // Copyright 2016 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.
 
-#ifndef CHROME_BROWSER_CHROMEOS_ARC_ARC_LOW_MEMORY_KILLER_MONITOR_H_
-#define CHROME_BROWSER_CHROMEOS_ARC_ARC_LOW_MEMORY_KILLER_MONITOR_H_
+#ifndef COMPONENTS_ARC_METRICS_ARC_LOW_MEMORY_KILLER_MONITOR_H_
+#define COMPONENTS_ARC_METRICS_ARC_LOW_MEMORY_KILLER_MONITOR_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/sequenced_worker_pool.h"
 
 namespace arc {
 
 // Trace lowmemorykiller events and report to UMA.
 //
 // If kernel lowmemorykiller is enabled, it would kill processes automatically
@@ skipping 17 matching lines @@
   // shutdown process while this thread returns from a blocking read.
   static void Run(scoped_refptr<base::SequencedWorkerPool> worker_pool);
 
   scoped_refptr<base::SequencedWorkerPool> worker_pool_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcLowMemoryKillerMonitor);
 };
 
 }  // namespace arc
 
-#endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_LOW_MEMORY_KILLER_MONITOR_H_"
+#endif  // COMPONENTS_ARC_METRICS_ARC_LOW_MEMORY_KILLER_MONITOR_H_