Refactor setup of background upload alert from MC to separate file.

ios/chrome/app/main_controller.mm

 // Copyright 2012 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/main_controller.h"
 
 #include <memory>
 #include <string>
 
 #import <CoreSpotlight/CoreSpotlight.h>
@@ skipping 27 matching lines @@
 #import "ios/chrome/app/application_delegate/metrics_mediator.h"
 #import "ios/chrome/app/application_delegate/url_opener.h"
 #include "ios/chrome/app/application_mode.h"
 #include "ios/chrome/app/chrome_app_startup_parameters.h"
 #import "ios/chrome/app/deferred_initialization_runner.h"
 #import "ios/chrome/app/main_controller_private.h"
 #import "ios/chrome/app/memory_monitor.h"
 #import "ios/chrome/app/safe_mode_crashing_modules_config.h"
 #import "ios/chrome/app/spotlight/spotlight_manager.h"
 #import "ios/chrome/app/spotlight/spotlight_util.h"
+#include "ios/chrome/app/startup/background_upload_alert.h"
 #include "ios/chrome/app/startup/chrome_main_starter.h"
 #include "ios/chrome/app/startup/client_registration.h"
 #include "ios/chrome/app/startup/ios_chrome_main.h"
 #include "ios/chrome/app/startup/network_stack_setup.h"
 #include "ios/chrome/app/startup/provider_registration.h"
 #include "ios/chrome/app/startup/register_experimental_settings.h"
 #include "ios/chrome/app/startup/setup_debugging.h"
 #import "ios/chrome/app/startup_tasks.h"
 #include "ios/chrome/app/tests_hook.h"
 #import "ios/chrome/browser/app_startup_parameters.h"
@@ skipping 612 matching lines @@
   // Resets the interval stats between two background fetch as this value may be
   // obsolete.
   [BackgroundActivity foregroundStarted];
 
   // Crash the app during startup if requested but only after we have enabled
   // uploading crash reports.
   [self crashIfRequested];
 
   RegisterComponentsForUpdate();
 
-  if (experimental_flags::IsAlertOnBackgroundUploadEnabled()) {
-    if ([UIApplication instancesRespondToSelector:
-                           @selector(registerUserNotificationSettings:)]) {
-      [[UIApplication sharedApplication]
-          registerUserNotificationSettings:
-              [UIUserNotificationSettings
-                  settingsForTypes:UIUserNotificationTypeAlert |
-                                   UIUserNotificationTypeBadge |
-                                   UIUserNotificationTypeSound
-                        categories:nil]];
-    }
-  }
+  [BackgroundUploadAlert setupBackgroundUploadAlert];
 
   // Remove the extra browser states as Chrome iOS is single profile in M48+.
   ChromeBrowserStateRemovalController::GetInstance()
       ->RemoveBrowserStatesIfNecessary();
 
   _browserStateManager =
       GetApplicationContext()->GetChromeBrowserStateManager();
   ios::ChromeBrowserState* chromeBrowserState =
       _browserStateManager->GetLastUsedBrowserState();
 
@@ skipping 1994 matching lines @@
   };
 
   callbackCounter->IncrementCount();
   [self removeBrowsingDataFromBrowserState:_mainBrowserState
                                       mask:removeAllMask
                                 timePeriod:browsing_data::ALL_TIME
                          completionHandler:decrementCallbackCounterCount];
 }
 
 @end