[ObjC ARC] Converts ios/chrome/common/app_group:client to ARC.Automatically generated ARCMigrate …

ios/chrome/common/app_group/app_group_metrics_client.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/common/app_group/app_group_metrics_client.h"
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsobject.h"
 #include "ios/chrome/common/app_group/app_group_constants.h"
 #include "ios/chrome/common/app_group/app_group_metrics.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 // Number of log files to keep in the |kPendingLogFileDirectory|. Any older file
 // may be deleted.
 const int kMaxFileNumber = 100;
 
 }  // namespace
 
 namespace app_group {
 namespace client_app {
@@ skipping 72 matching lines @@
     NSString* path =
         [[sorted_files objectAtIndex:file_index] objectForKey:@"path"];
     NSURL* file_url =
         [log_dir_url URLByAppendingPathComponent:path isDirectory:NO];
     [file_manager removeItemAtURL:file_url error:nil];
   }
 }
 
 }  // namespace client_app
 }  // namespace app_group