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

ios/chrome/browser/ui/bookmarks/bookmark_folder_view_controller.h

 // Copyright 2014 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_BOOKMARKS_BOOKMARK_FOLDER_VIEW_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_FOLDER_VIEW_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 #include <set>
 
@@ skipping 13 matching lines @@
 - (void)folderPickerDidCancel:(BookmarkFolderViewController*)folderPicker;
 @end
 
 // A folder selector view controller.
 //
 // This controller monitors the state of the bookmark model, so changes to the
 // bookmark model can affect this controller's state.
 // The bookmark model is assumed to be loaded, thus also not to be NULL.
 @interface BookmarkFolderViewController : UIViewController
 
-@property(nonatomic, assign) id<BookmarkFolderViewControllerDelegate> delegate;
+@property(nonatomic, weak) id<BookmarkFolderViewControllerDelegate> delegate;
 
 // The current nodes (bookmarks or folders) that are considered for a move.
 @property(nonatomic, assign, readonly)
     const std::set<const bookmarks::BookmarkNode*>& editedNodes;
 
 // Initializes the view controller with a bookmarks model. |allowsNewFolders|
 // will instruct the controller to provide the necessary UI to create a folder.
 // |bookmarkModel| must not be NULL and must be loaded.
 // |editedNodes| affects which cells can be selected, since it is not possible
 // to move a node into its subnode.
@@ skipping 33 matching lines @@
 // be called by subclasses if they override this method in order to maintain
 // this functionality.
 - (void)scrollViewWillEndDragging:(UIScrollView*)scrollView
                      withVelocity:(CGPoint)velocity
               targetContentOffset:(inout CGPoint*)targetContentOffset
     NS_REQUIRES_SUPER;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_FOLDER_VIEW_CONTROLLER_H_