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

ios/chrome/browser/ui/side_swipe/side_swipe_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_SIDE_SWIPE_SIDE_SWIPE_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_SIDE_SWIPE_SIDE_SWIPE_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #include "ios/chrome/browser/infobars/infobar_container_ios.h"
@@ skipping 60 matching lines @@
 
 // Controls how an edge gesture is processed, either as tab change or a page
 // change.  For tab changes two full screen CardSideSwipeView views are dragged
 // across the screen. For page changes the SideSwipeControllerDelegate
 // |contentView| is moved across the screen and a SideSwipeNavigationView is
 // shown in the remaining space.
 @interface SideSwipeController
     : NSObject<CRWSwipeRecognizerProvider, UIGestureRecognizerDelegate>
 
 @property(nonatomic, assign) BOOL inSwipe;
-@property(nonatomic, assign) id<SideSwipeControllerDelegate> swipeDelegate;
-@property(nonatomic, assign) id<TabSnapshottingDelegate> snapshotDelegate;
+@property(nonatomic, weak) id<SideSwipeControllerDelegate> swipeDelegate;
+@property(nonatomic, weak) id<TabSnapshottingDelegate> snapshotDelegate;
 
 // Initializer.
 - (id)initWithTabModel:(TabModel*)model
           browserState:(ios::ChromeBrowserState*)browserState;
 
 // Set up swipe gesture recognizers.
 - (void)addHorizontalGesturesToView:(UIView*)view;
 
 // Returns set of UIGestureRecognizer objects.
 - (NSSet*)swipeRecognizers;
 
 // Enable or disable the side swipe gesture recognizer.
 - (void)setEnabled:(BOOL)enabled;
 
 // Returns |NO| if the device should not rotate.
 - (BOOL)shouldAutorotate;
 
 // Resets the swipeDelegate's contentView frame origin x position to zero.
 - (void)resetContentView;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_SIDE_SWIPE_SIDE_SWIPE_CONTROLLER_H_