Extract guts of ChromeStabilityMetricsProvider into helper class

components/metrics/system_memory_stats_recorder_win.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 "chrome/browser/memory/system_memory_stats_recorder.h"
+#include "components/metrics/system_memory_stats_recorder.h"
 
 #include <windows.h>
 
 #include "base/metrics/histogram_macros.h"
 #include "base/process/process_metrics.h"
 
-namespace memory {
+namespace metrics {
 
 void RecordMemoryStats(RecordMemoryStatsType type) {
   MEMORYSTATUSEX mem_status;
   mem_status.dwLength = sizeof(mem_status);
   if (!::GlobalMemoryStatusEx(&mem_status))
     return;
 
   switch (type) {
     case RECORD_MEMORY_STATS_TAB_DISCARDED: {
       UMA_HISTOGRAM_CUSTOM_COUNTS("Memory.Stats.Win.MemoryLoad",
@@ skipping 11 matching lines @@
       UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.AvailVirtual",
                                     mem_status.ullAvailVirtual);
       break;
     }
     default:
       NOTREACHED() << L"Received unexpected notification";
       break;
   }
 }
 
-}  // namespace memory
+}  // namespace metrics