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

ios/chrome/browser/ui/stack_view/card_view.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_STACK_VIEW_CARD_VIEW_H_
 #define IOS_CHROME_BROWSER_UI_STACK_VIEW_CARD_VIEW_H_
 
 #import <UIKit/UIKit.h>
 
 struct LayoutRect;
@@ skipping 34 matching lines @@
 // A view class for displaying a card in the tab-switching stack. Has a title
 // and an image. On its target, has actions for when the close box is clicked,
 // when the card is selected, when it's dragged, and when VoiceOver focuses on
 // its title label or close button.
 @interface CardView : UIView
 
 // |YES| if this card represents the current active tab.
 @property(nonatomic, assign) BOOL isActiveTab;
 
 // The snapshot displayed on the card.
-@property(nonatomic, retain) UIImage* image;
+@property(nonatomic, strong) UIImage* image;
 
 // Whether the card view should render its shadow.
 @property(nonatomic, assign) BOOL shouldShowShadow;
 
 // Whether the card view should mask its shadow to only the overlapping portion.
 @property(nonatomic, assign) BOOL shouldMaskShadow;
 
 // The side on which to draw the close button.
 @property(nonatomic, assign) CardCloseButtonSide closeButtonSide;
 
@@ skipping 65 matching lines @@
 
 // The LayoutRect for CardTabView.
 - (LayoutRect)tabLayout;
 
 // The a11y ID of the "close" button in the find-in-page bar.
 @property(nonatomic, readonly) NSString* closeButtonId;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_STACK_VIEW_CARD_VIEW_H_