[ObjC ARC] Converts ios/chrome/app/application_delegate:application_delegate_internal to ARC.

ios/chrome/app/application_delegate/metrics_mediator.mm

 // 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.
 
 #import "ios/chrome/app/application_delegate/metrics_mediator.h"
 
-#include "base/ios/weak_nsobject.h"
 #include "base/mac/bind_objc_block.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/crash/core/common/crash_keys.h"
 #include "components/metrics/metrics_pref_names.h"
 #include "components/metrics/metrics_service.h"
 #include "components/prefs/pref_service.h"
 #import "ios/chrome/app/application_delegate/startup_information.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #include "ios/chrome/browser/crash_report/breakpad_helper.h"
 #import "ios/chrome/browser/crash_report/crash_report_background_uploader.h"
 #include "ios/chrome/browser/experimental_flags.h"
 #include "ios/chrome/browser/metrics/first_user_action_recorder.h"
 #import "ios/chrome/browser/metrics/previous_session_info.h"
 #import "ios/chrome/browser/net/connection_type_observer_bridge.h"
 #include "ios/chrome/browser/pref_names.h"
 #import "ios/chrome/browser/tabs/tab.h"
 #import "ios/chrome/browser/tabs/tab_model.h"
 #import "ios/chrome/browser/ui/main/browser_view_information.h"
 #include "ios/chrome/common/app_group/app_group_metrics_mainapp.h"
 #include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #include "ios/public/provider/chrome/browser/distribution/app_distribution_provider.h"
 #include "ios/web/public/web_thread.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 // The amount of time (in seconds) between two background fetch calls.
 // TODO(crbug.com/496172): Re-enable background fetch.
 const NSTimeInterval kBackgroundFetchIntervalDelay =
     UIApplicationBackgroundFetchIntervalNever;
 // The amount of time (in seconds) to wait for the user to start a new task.
 const NSTimeInterval kFirstUserActionTimeout = 30.0;
 }  // namespace
 
 namespace metrics_mediator {
@@ skipping 187 matching lines @@
                                     ->GetDistributionBrandCode());
     app_group::main_app::EnableMetrics(
         base::SysUTF8ToNSString(metrics->GetClientId()), brandCode,
         prefs->GetInt64(metrics::prefs::kInstallDate),
         prefs->GetInt64(metrics::prefs::kMetricsReportingEnabledTimestamp));
   } else {
     app_group::main_app::DisableMetrics();
   }
 
   // If metrics are enabled, process the logs. Otherwise, just delete them.
-  base::mac::ScopedBlock<app_group::ProceduralBlockWithData> callback;
+  app_group::ProceduralBlockWithData callback;
   if (enabled) {
-    callback.reset(
-        ^(NSData* log_content) {
-          std::string log(static_cast<const char*>([log_content bytes]),
-                          static_cast<size_t>([log_content length]));
-          web::WebThread::PostTask(web::WebThread::UI, FROM_HERE,
-                                   base::BindBlock(^{
-                                     metrics->PushExternalLog(log);
-                                   }));
-        },
-        base::scoped_policy::RETAIN);
+    callback = [^(NSData* log_content) {
+      std::string log(static_cast<const char*>([log_content bytes]),
+                      static_cast<size_t>([log_content length]));
+      web::WebThread::PostTask(web::WebThread::UI, FROM_HERE,
+                               base::BindBlockArc(^{
+                                 metrics->PushExternalLog(log);
+                               }));
+    } copy];
   }
 
   web::WebThread::PostTask(
       web::WebThread::FILE, FROM_HERE,
       base::Bind(&app_group::main_app::ProcessPendingLogs, callback));
 }
 
 - (void)processCrashReportsPresentAtStartup {
   _hasProcessedCrashReportsPresentAtStartup = YES;
 
@@ skipping 122 matching lines @@
 }
 
 - (BOOL)isMetricsReportingEnabledWifiOnly {
   return GetApplicationContext()->GetLocalState()->GetBoolean(
              metrics::prefs::kMetricsReportingEnabled) &&
          GetApplicationContext()->GetLocalState()->GetBoolean(
              prefs::kMetricsReportingWifiOnly);
 }
 
 @end