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

ios/chrome/browser/ui/bookmarks/bookmark_promo_controller.mm

 // Copyright 2014 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/ui/bookmarks/bookmark_promo_controller.h"
 
 #include <memory>
 
-#include "base/mac/scoped_nsobject.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/user_metrics.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/pref_service.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/pref_names.h"
 #include "ios/chrome/browser/signin/signin_manager_factory.h"
 #import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
 #import "ios/chrome/browser/ui/commands/show_signin_command.h"
 #import "ios/chrome/browser/ui/ui_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 // Enum is used to record the actions performed by the user on the promo cell.
 // |Stars.PromoActions|.
 enum {
   // Recorded each time the promo cell is presented to the user.
   BOOKMARKS_PROMO_ACTION_DISPLAYED,
   // The user selected the NO THANKS button.
   BOOKMARKS_PROMO_ACTION_DISMISSED,
   // The user selected the SIGN-IN button.
   BOOKMARKS_PROMO_ACTION_COMPLETED,
@@ skipping 46 matching lines @@
                                            username:username
                                            password:password];
   }
 
   void GoogleSignedOut(const std::string& account_id,
                        const std::string& username) override {
     [controller_ googleSignedOutWithAcountId:account_id username:username];
   }
 
  private:
-  // Weak
-  BookmarkPromoController* controller_;
+  __weak BookmarkPromoController* controller_;
 };
 }  // namespace
 
 @implementation BookmarkPromoController
 
 @synthesize delegate = _delegate;
 @synthesize promoState = _promoState;
 
 + (void)registerBrowserStatePrefs:(user_prefs::PrefRegistrySyncable*)registry {
   registry->RegisterBooleanPref(prefs::kIosBookmarkPromoAlreadySeen, false);
@@ skipping 20 matching lines @@
   return self;
 }
 
 - (void)dealloc {
   if (!_isIncognito) {
     DCHECK(_browserState);
     SigninManager* signinManager =
         ios::SigninManagerFactory::GetForBrowserState(_browserState);
     signinManager->RemoveObserver(_signinObserver.get());
   }
-  [super dealloc];
 }
 
 - (void)showSignIn {
   UMA_HISTOGRAM_ENUMERATION(kBookmarksPromoActionsHistogram,
                             BOOKMARKS_PROMO_ACTION_COMPLETED,
                             BOOKMARKS_PROMO_ACTION_COUNT);
   base::RecordAction(
       base::UserMetricsAction("Signin_Signin_FromBookmarkManager"));
-  base::scoped_nsobject<ShowSigninCommand> command([[ShowSigninCommand alloc]
+  ShowSigninCommand* command = [[ShowSigninCommand alloc]
       initWithOperation:AUTHENTICATION_OPERATION_SIGNIN
       signInAccessPoint:signin_metrics::AccessPoint::
-                            ACCESS_POINT_BOOKMARK_MANAGER]);
+                            ACCESS_POINT_BOOKMARK_MANAGER];
   [self chromeExecuteCommand:command];
 }
 
 - (void)hidePromoCell {
   DCHECK(!_isIncognito);
   DCHECK(_browserState);
 
   UMA_HISTOGRAM_ENUMERATION(kBookmarksPromoActionsHistogram,
                             BOOKMARKS_PROMO_ACTION_DISMISSED,
                             BOOKMARKS_PROMO_ACTION_COUNT);
@@ skipping 53 matching lines @@
   self.promoState = NO;
 }
 
 // Called when the currently signed-in user for a user has been signed out.
 - (void)googleSignedOutWithAcountId:(const std::string&)account_id
                            username:(const std::string&)username {
   [self updatePromoState];
 }
 
 @end