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

ios/chrome/browser/ui/settings/sync_encryption_passphrase_collection_view_controller.h

 // Copyright 2015 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.
 
 #ifndef IOS_CHROME_BROWSER_UI_SETTINGS_SYNC_ENCRYPTION_PASSPHRASE_COLLECTION_VIEW_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_SETTINGS_SYNC_ENCRYPTION_PASSPHRASE_COLLECTION_VIEW_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #import "ios/chrome/browser/sync/sync_observer_bridge.h"
@@ skipping 17 matching lines @@
   ItemTypeError,
   ItemTypeFooter,
 };
 }  // namespace sync_encryption_passphrase
 }  // namespace ios_internal
 
 // Controller to allow user to specify encryption passphrase for Sync.
 @interface SyncEncryptionPassphraseCollectionViewController
     : SettingsRootCollectionViewController<SyncObserverModelBridge>
 
-@property(nonatomic, readonly) UITextField* passphrase;
+@property(weak, nonatomic, readonly) UITextField* passphrase;

[lpromero, 2017/04/13 10:02:29]

Idem, this should be strong.

[stkhapugin, 2017/04/13 14:48:31]

Done.

 @property(nonatomic, copy) NSString* headerMessage;
 @property(nonatomic, copy) NSString* footerMessage;
 @property(nonatomic, copy) NSString* processingMessage;
 @property(nonatomic, copy) NSString* syncErrorMessage;
 
 // |browserState| must not be nil.
 - (instancetype)initWithBrowserState:(ios::ChromeBrowserState*)browserState
     NS_DESIGNATED_INITIALIZER;
 - (instancetype)initWithStyle:(CollectionViewControllerStyle)style
     NS_UNAVAILABLE;
@@ skipping 33 matching lines @@
 // Called after a touch event leaving a |UITextField| by clicking "return" key.
 - (void)textFieldDidEndEditing:(id)sender;
 
 // Stops observing the sync service. This is required during the shutdown phase
 // to avoid observing sync events for a browser state that is being killed.
 - (void)stopObserving;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_SETTINGS_SYNC_ENCRYPTION_PASSPHRASE_COLLECTION_VIEW_CONTROLLER_H_