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

ios/chrome/browser/ui/infobars/infobar_view.h

 // Copyright (c) 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_INFOBARS_INFOBAR_VIEW_H_
 #define IOS_CHROME_BROWSER_UI_INFOBARS_INFOBAR_VIEW_H_
 
 #import <UIKit/UIKit.h>
 
 #import "ios/chrome/browser/ui/fancy_ui/bidi_container_view.h"
 
 class InfoBarViewDelegate;
 
 // UIView representing a single infobar.
 @interface InfoBarView : BidiContainerView
 
 - (instancetype)initWithFrame:(CGRect)frame
                      delegate:(InfoBarViewDelegate*)delegate;
 
 // How much of infobar is visible. The infobar is only partly visible during
 // showing/hiding animation.
 @property(nonatomic, assign) CGFloat visibleHeight;
 
 // Label text with links initialized with |stringAsLink:|.
-@property(nonatomic, readonly) NSString* markedLabel;
+@property(nonatomic, strong, readonly) NSString* markedLabel;
 
 // Stops propagating events to delegate.
 - (void)resetDelegate;
 
 // TODO(crbug.com/302582): rename methods from add* to set*.
 // Adds a dismiss button subview.
 - (void)addCloseButtonWithTag:(NSInteger)tag
                        target:(id)target
                        action:(SEL)action;
 
@@ skipping 38 matching lines @@
 // Adds to the infobar a switch and an adjacent label.
 - (void)addSwitchWithLabel:(NSString*)label
                       isOn:(BOOL)isOn
                        tag:(NSInteger)tag
                     target:(id)target
                     action:(SEL)action;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_INFOBARS_INFOBAR_VIEW_H_