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

ios/chrome/browser/crash_report/crash_restore_helper.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/browser/crash_report/crash_restore_helper.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/metrics/histogram_macros.h"
@@ skipping 11 matching lines @@
 #include "ios/chrome/browser/sessions/ios_chrome_tab_restore_service_factory.h"
 #import "ios/chrome/browser/sessions/session_ios.h"
 #import "ios/chrome/browser/sessions/session_service_ios.h"
 #import "ios/chrome/browser/sessions/session_window_ios.h"
 #import "ios/chrome/browser/tabs/tab.h"
 #import "ios/chrome/browser/tabs/tab_model.h"
 #include "ios/chrome/grit/ios_theme_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @protocol InfoBarManagerObserverBridgeProtocol
 - (void)infoBarRemoved:(infobars::InfoBar*)infobar;
 @end
 
 // Private methods.
 @interface CrashRestoreHelper ()<InfoBarManagerObserverBridgeProtocol>
 // Deletes the session file for the given browser state, optionally backing it
 // up beforehand to |backupFile| if it is not nil.  This method returns YES in
 // case of success, NO otherwise.
 - (BOOL)deleteSessionForBrowserState:(ios::ChromeBrowserState*)browserState
@@ skipping 61 matching lines @@
   InfoBarIdentifier GetIdentifier() const override;
 
   // ConfirmInfoBarDelegate:
   base::string16 GetMessageText() const override;
   int GetButtons() const override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
   bool Accept() override;
   int GetIconId() const override;
 
   // The CrashRestoreHelper to restore sessions.
-  base::scoped_nsobject<CrashRestoreHelper> crash_restore_helper_;
-  // The TabModel to restore sessions to.
-  base::scoped_nsobject<TabModel> tab_model_;
+  CrashRestoreHelper* crash_restore_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionCrashedInfoBarDelegate);
 };
 
 SessionCrashedInfoBarDelegate::SessionCrashedInfoBarDelegate(
     CrashRestoreHelper* crash_restore_helper)
-    : crash_restore_helper_([crash_restore_helper retain]) {}
+    : crash_restore_helper_(crash_restore_helper) {}
 
 SessionCrashedInfoBarDelegate::~SessionCrashedInfoBarDelegate() {}
 
 // static
 bool SessionCrashedInfoBarDelegate::Create(
     infobars::InfoBarManager* infobar_manager,
     CrashRestoreHelper* crash_restore_helper) {
   DCHECK(infobar_manager);
   std::unique_ptr<ConfirmInfoBarDelegate> delegate(
       new SessionCrashedInfoBarDelegate(crash_restore_helper));
@@ skipping 31 matching lines @@
   return IDR_IOS_INFOBAR_RESTORE_SESSION;
 }
 
 }  // namespace
 
 @implementation CrashRestoreHelper {
   ios::ChromeBrowserState* _browserState;
   BOOL _needRestoration;
   std::unique_ptr<InfoBarManagerObserverBridge> _infoBarBridge;
   // The TabModel to restore sessions to.
-  base::scoped_nsobject<TabModel> _tabModel;
+  TabModel* _tabModel;
 
   // Indicate that the session has been restored to tabs or to recently closed
   // and should not be rerestored.
   BOOL _sessionRestored;
 }
 
 - (id)initWithBrowserState:(ios::ChromeBrowserState*)browserState {
   if (self = [super init]) {
     _browserState = browserState;
   }
   return self;
 }
 
 - (void)showRestoreIfNeeded:(TabModel*)tabModel {
   if (!_needRestoration)
     return;
 
   // The last session didn't exit cleanly. Show an infobar to the user so
   // that they can restore if they want. The delegate deletes itself when
   // it is closed.
   DCHECK([tabModel currentTab]);
   infobars::InfoBarManager* infoBarManager =
       [[tabModel currentTab] infoBarManager];
-  _tabModel.reset([tabModel retain]);
+  _tabModel = tabModel;
   SessionCrashedInfoBarDelegate::Create(infoBarManager, self);
   _infoBarBridge.reset(new InfoBarManagerObserverBridge(infoBarManager, self));
 }
 
 - (BOOL)deleteSessionForBrowserState:(ios::ChromeBrowserState*)browserState
                           backupFile:(NSString*)file {
   NSString* stashPath =
       base::SysUTF8ToNSString(browserState->GetStatePath().value());
   NSString* sessionPath = [SessionServiceIOS sessionPathForDirectory:stashPath];
   NSFileManager* fileManager = [NSFileManager defaultManager];
@@ skipping 93 matching lines @@
         web::WebState::CreateWithStorageSession(params, session);
     // Add all tabs at the 0 position as the position is relative to an old
     // tabModel.
     tabRestoreService->CreateHistoricalTab(
         sessions::IOSLiveTab::GetForWebState(webState.get()), 0);
   }
   return;
 }
 
 @end