[ObjC ARC] Converts ios/chrome/browser/metrics:metrics to ARC.Automatically generated ARCMigrate …

ios/chrome/browser/metrics/mobile_session_shutdown_metrics_provider.mm

 // 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 "ios/chrome/browser/metrics/mobile_session_shutdown_metrics_provider.h"
 
 #include <Foundation/Foundation.h>
 
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "components/metrics/metrics_service.h"
 #include "ios/chrome/browser/crash_report/breakpad_helper.h"
 #import "ios/chrome/browser/crash_report/crash_report_background_uploader.h"
 #import "ios/chrome/browser/metrics/previous_session_info.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 // Logs |type| in the shutdown type histogram.
 void LogShutdownType(MobileSessionShutdownType type) {
   UMA_STABILITY_HISTOGRAM_ENUMERATION("Stability.MobileSessionShutdownType",
                                       type, MOBILE_SESSION_SHUTDOWN_TYPE_COUNT);
 }
 
 }  // namespace
 
@@ skipping 57 matching lines @@
 bool MobileSessionShutdownMetricsProvider::
     HasUploadedCrashReportsInBackground() {
   return [CrashReportBackgroundUploader hasUploadedCrashReportsInBackground];
 }
 
 bool MobileSessionShutdownMetricsProvider::
     ReceivedMemoryWarningBeforeLastShutdown() {
   return [[PreviousSessionInfo sharedInstance]
       didSeeMemoryWarningShortlyBeforeTerminating];
 }