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

ios/chrome/browser/ui/native_content_controller.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_UI_NATIVE_CONTENT_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_NATIVE_CONTENT_CONTROLLER_H_
 
 #import <Foundation/Foundation.h>
 
 #import "ios/web/public/web_state/ui/crw_native_content.h"
 
 class GURL;
 @class UIView;
 
 // Abstract base class for controllers that implement the behavior for native
 // views that are presented inside the web content area. Automatically removes
 // |view| from the view hierarchy when it is destroyed. Subclasses are
 // responsible for setting the view (usually through loading a nib) and the
 // page title.
 @interface NativeContentController : NSObject<CRWNativeContent>
 
 // Top-level view.
-@property(nonatomic, retain) IBOutlet UIView* view;
+@property(nonatomic, strong) IBOutlet UIView* view;
 @property(nonatomic, copy) NSString* title;
 @property(nonatomic, readonly, assign) const GURL& url;
 
 // Initializer that attempts to load the nib specified in |nibName|, which may
 // be nil. The |url| is the url to be loaded.
 - (instancetype)initWithNibName:(NSString*)nibName
                             url:(const GURL&)url NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)init NS_UNAVAILABLE;
 
 // Initializer with the |url| to be loaded.
 - (instancetype)initWithURL:(const GURL&)url;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_NATIVE_CONTENT_CONTROLLER_H_