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

ios/chrome/browser/ui/toolbar/web_toolbar_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_TOOLBAR_WEB_TOOLBAR_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_TOOLBAR_WEB_TOOLBAR_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #include "ios/chrome/browser/ui/omnibox/omnibox_popup_positioner.h"
@@ skipping 69 matching lines @@
 - (void)onFakeboxAnimationComplete;
 @end
 
 // Web-view specific toolbar, adding navigation controls like back/forward,
 // omnibox, etc.
 @interface WebToolbarController
     : ToolbarController<OmniboxFocuser,
                         QRScannerViewControllerDelegate,
                         VoiceSearchControllerDelegate>
 
-@property(nonatomic, assign) id<WebToolbarDelegate> delegate;
-@property(nonatomic, assign, readonly) id<UrlLoader> urlLoader;
+@property(nonatomic, weak) id<WebToolbarDelegate> delegate;
+@property(nonatomic, weak, readonly) id<UrlLoader> urlLoader;
 
 // Mark inherited initializer as unavailable.
 - (instancetype)initWithStyle:(ToolbarControllerStyle)style NS_UNAVAILABLE;
 
 // Create a new web toolbar controller whose omnibox is backed by
 // |browserState|.
 - (instancetype)initWithDelegate:(id<WebToolbarDelegate>)delegate
                        urlLoader:(id<UrlLoader>)urlLoader
                     browserState:(ios::ChromeBrowserState*)browserState
                  preloadProvider:(id<PreloadProvider>)preloader
@@ skipping 58 matching lines @@
 - (BOOL)isOmniboxFirstResponder;
 
 // Returns whether the omnibox popup is currently displayed.
 - (BOOL)showingOmniboxPopup;
 
 - (void)traitCollectionDidChange:(UITraitCollection*)previousTraitCollection;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_TOOLBAR_WEB_TOOLBAR_CONTROLLER_H_