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

ios/chrome/browser/native_app_launcher/native_app_infobar_controller.mm

 // Copyright 2013 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/native_app_launcher/native_app_infobar_controller.h"
 
 #include "base/logging.h"
-#include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ios/chrome/browser/native_app_launcher/native_app_infobar_delegate.h"
 #import "ios/chrome/browser/ui/infobars/infobar_view.h"
 #include "ios/chrome/browser/ui/infobars/infobar_view.h"
 #include "ios/chrome/grit/ios_strings.h"
 #import "ios/public/provider/chrome/browser/native_app_launcher/native_app_types.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @interface NativeAppInfoBarController ()
 
 // Action for any of the user defined buttons.
 - (void)infoBarButtonDidPress:(UIButton*)button;
 
 // Notifies the delegate of which action the user took.
 - (void)userPerformedAction:(NativeAppActionType)userAction;
 
 // For testing.
 // Sets the infobar delegate.
 - (void)setInfoBarDelegate:(NativeAppInfoBarDelegate*)delegate;
 
 @end
 
 @implementation NativeAppInfoBarController {
   NativeAppInfoBarDelegate* nativeAppInfoBarDelegate_;  // weak
 }
 
 #pragma mark - InfoBarController
 
 - (InfoBarView*)viewForDelegate:(infobars::InfoBarDelegate*)delegate
                           frame:(CGRect)frame {
-  base::scoped_nsobject<InfoBarView> infoBarView;
+  InfoBarView* infoBarView;
   nativeAppInfoBarDelegate_ = static_cast<NativeAppInfoBarDelegate*>(delegate);
   DCHECK(nativeAppInfoBarDelegate_);
-  infoBarView.reset(
-      [[InfoBarView alloc] initWithFrame:frame delegate:self.delegate]);
+  infoBarView =
+      [[InfoBarView alloc] initWithFrame:frame delegate:self.delegate];
 
   // Lays out widgets common to all NativeAppInfobars.
   [infoBarView
       addPlaceholderTransparentIcon:native_app_infobar::kSmallIconSize];
   nativeAppInfoBarDelegate_->FetchSmallAppIcon(^(UIImage* image) {
     [infoBarView addLeftIconWithRoundedCornersAndShadow:image];
   });
   [infoBarView addCloseButtonWithTag:NATIVE_APP_ACTION_DISMISS
                               target:self
                               action:@selector(infoBarButtonDidPress:)];
@@ skipping 35 matching lines @@
       [infoBarView addLabel:labelMsg];
       [infoBarView addButton1:buttonOnceString
                          tag1:NATIVE_APP_ACTION_CLICK_ONCE
                       button2:buttonAlwaysString
                          tag2:NATIVE_APP_ACTION_CLICK_ALWAYS
                        target:self
                        action:@selector(infoBarButtonDidPress:)];
       break;
     }
   }
-  return [[infoBarView retain] autorelease];
+  return infoBarView;
 }
 
 - (void)infoBarButtonDidPress:(UIButton*)button {
   DCHECK(nativeAppInfoBarDelegate_);
   DCHECK([button isKindOfClass:[UIButton class]]);
   // This press might have occurred after the user has already pressed a button,
   // in which case the view has been detached from the delegate and this press
   // should be ignored.
   if (!self.delegate) {
     return;
   }
   self.delegate->InfoBarDidCancel();
   NativeAppActionType action = static_cast<NativeAppActionType>([button tag]);
   [self userPerformedAction:action];
 }
 
 - (void)userPerformedAction:(NativeAppActionType)userAction {
   nativeAppInfoBarDelegate_->UserPerformedAction(userAction);
 }
 
 #pragma mark - Testing
 
 - (void)setInfoBarDelegate:(NativeAppInfoBarDelegate*)delegate {
   nativeAppInfoBarDelegate_ = delegate;
 }
 
 @end