Fix a memory leak in ios bookmarks.

ios/chrome/browser/ui/bookmarks/bookmark_edit_view_controller.mm

Index: ios/chrome/browser/ui/bookmarks/bookmark_edit_view_controller.mm
diff --git a/ios/chrome/browser/ui/bookmarks/bookmark_edit_view_controller.mm b/ios/chrome/browser/ui/bookmarks/bookmark_edit_view_controller.mm
index 1c01fe309b6d0f33f8d3f5b70d5761913c1ff796..96a88858ed36cc44acd1f870da1d4a675c70f7ad 100644
--- a/ios/chrome/browser/ui/bookmarks/bookmark_edit_view_controller.mm
+++ b/ios/chrome/browser/ui/bookmarks/bookmark_edit_view_controller.mm
@@ -357,8 +357,8 @@ typedef NS_ENUM(NSInteger, ItemType) {
   self.nameItem.delegate = self;
   [model addItem:self.nameItem toSectionWithIdentifier:SectionIdentifierInfo];
 
-  self.folderItem =
-      [[BookmarkParentFolderItem alloc] initWithType:ItemTypeFolder];
+  self.folderItem = [[[BookmarkParentFolderItem alloc]
+      initWithType:ItemTypeFolder] autorelease];
   self.folderItem.title = bookmark_utils_ios::TitleForBookmarkNode(self.folder);
   [model addItem:self.folderItem toSectionWithIdentifier:SectionIdentifierInfo];