[ObjC ARC] Converts ios/chrome/browser/web:web to ARC.

ios/chrome/browser/web/resubmit_data_controller.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/browser/web/resubmit_data_controller.h"
 
 #import "base/logging.h"
-#include "base/mac/scoped_block.h"
-#import "base/mac/scoped_nsobject.h"
 #include "components/strings/grit/components_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @interface ResubmitDataController () {
-  base::scoped_nsobject<UIAlertController> _alertController;
+  UIAlertController* _alertController;
 }
 @end
 
 @implementation ResubmitDataController
 
 - (instancetype)init {
   NOTREACHED();
   return nil;
 }
 
 - (instancetype)initWithContinueBlock:(ProceduralBlock)continueBlock
                           cancelBlock:(ProceduralBlock)cancelBlock {
   DCHECK(continueBlock);
   DCHECK(cancelBlock);
   self = [super init];
   if (self) {
     NSString* message = [NSString
         stringWithFormat:@"%@\n\n%@",
                          l10n_util::GetNSString(IDS_HTTP_POST_WARNING_TITLE),
                          l10n_util::GetNSString(IDS_HTTP_POST_WARNING)];
     NSString* buttonTitle =
         l10n_util::GetNSString(IDS_HTTP_POST_WARNING_RESEND);
     NSString* cancelTitle = l10n_util::GetNSString(IDS_CANCEL);
 
-    _alertController.reset([[UIAlertController
+    _alertController = [UIAlertController
         alertControllerWithTitle:nil
                          message:message
-                  preferredStyle:UIAlertControllerStyleActionSheet] retain]);
-
+                  preferredStyle:UIAlertControllerStyleActionSheet];
     // Make sure the blocks are located on the heap.
-    base::mac::ScopedBlock<ProceduralBlock> guaranteeOnHeap;
-    guaranteeOnHeap.reset([continueBlock copy]);
-    guaranteeOnHeap.reset([cancelBlock copy]);
+    continueBlock = [continueBlock copy];
+    cancelBlock = [cancelBlock copy];
 
     UIAlertAction* cancelAction =
         [UIAlertAction actionWithTitle:cancelTitle
                                  style:UIAlertActionStyleCancel
                                handler:^(UIAlertAction* _Nonnull action) {
                                  cancelBlock();
                                }];
     [_alertController addAction:cancelAction];
     UIAlertAction* continueAction =
         [UIAlertAction actionWithTitle:buttonTitle
                                  style:UIAlertActionStyleDefault
                                handler:^(UIAlertAction* _Nonnull action) {
                                  continueBlock();
                                }];
     [_alertController addAction:continueAction];
   }
   return self;
 }
 
 - (void)presentActionSheetFromRect:(CGRect)rect inView:(UIView*)view {
-  _alertController.get().modalPresentationStyle = UIModalPresentationPopover;
+  _alertController.modalPresentationStyle = UIModalPresentationPopover;
   UIPopoverPresentationController* popPresenter =
-      _alertController.get().popoverPresentationController;
+      _alertController.popoverPresentationController;
   popPresenter.sourceView = view;
   popPresenter.sourceRect = rect;
 
   UIViewController* topController = view.window.rootViewController;
   while (topController.presentedViewController)
     topController = topController.presentedViewController;
   [topController presentViewController:_alertController
                               animated:YES
                             completion:nil];
 }
 
 - (void)dismissActionSheet {
-  [_alertController.get().presentingViewController
-      dismissViewControllerAnimated:YES
-                         completion:nil];
+  [_alertController.presentingViewController dismissViewControllerAnimated:YES
+                                                                completion:nil];
 }
 
 @end