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

ios/chrome/browser/ui/side_swipe/card_side_swipe_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_SIDE_SWIPE_CARD_SIDE_SWIPE_VIEW_H_
 #define IOS_CHROME_BROWSER_UI_SIDE_SWIPE_CARD_SIDE_SWIPE_VIEW_H_
 
 #import <UIKit/UIKit.h>
 
 #include "base/mac/scoped_nsobject.h"
@@ skipping 24 matching lines @@
   // Space reserved at the top for the toolbar.
   CGFloat topMargin_;
 
   // Tab model.
   TabModel* model_;  // weak
 
   // The image view containing the background image.
   base::scoped_nsobject<UIImageView> backgroundView_;
 }
 
-@property(nonatomic, assign) id<SideSwipeControllerDelegate> delegate;
+@property(nonatomic, weak) id<SideSwipeControllerDelegate> delegate;
 @property(nonatomic, assign) CGFloat topMargin;
 
 - (id)initWithFrame:(CGRect)frame
           topMargin:(CGFloat)margin
               model:(TabModel*)model;
 - (void)updateViewsForDirection:(UISwipeGestureRecognizerDirection)direction
                     withToolbar:(WebToolbarController*)toolbarController;
 - (void)handleHorizontalPan:(SideSwipeGestureRecognizer*)gesture;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_SIDE_SWIPE_CARD_SIDE_SWIPE_VIEW_H_