Revert of Removing "All Bookmarks"

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

Index: ios/chrome/browser/ui/bookmarks/bookmark_utils_ios.mm
diff --git a/ios/chrome/browser/ui/bookmarks/bookmark_utils_ios.mm b/ios/chrome/browser/ui/bookmarks/bookmark_utils_ios.mm
index 80b9d30892eed0c2b379aaf359686c6810b97cc4..4c6a27bc5f9edfed447bb5df9ab716ab1a00071c 100644
--- a/ios/chrome/browser/ui/bookmarks/bookmark_utils_ios.mm
+++ b/ios/chrome/browser/ui/bookmarks/bookmark_utils_ios.mm
@@ -626,6 +626,9 @@
           cacheForMenuItemFolderWithPosition:position
                                     folderId:item.folder->id()];
       break;
+    case bookmarks::MenuItemAll:
+      cache = [BookmarkPositionCache cacheForMenuItemAllWithPosition:position];
+      break;
     case bookmarks::MenuItemDivider:
     case bookmarks::MenuItemSectionHeader:
       NOTREACHED();
@@ -656,6 +659,11 @@
     return NO;
 
   switch (cache.type) {
+    case bookmarks::MenuItemAll:
+      if (!experimental_flags::IsAllBookmarksEnabled())
+        return NO;
+      *item = [BookmarkMenuItem allMenuItem];
+      break;
     case bookmarks::MenuItemFolder: {
       const BookmarkNode* bookmark = FindFolderById(model, cache.folderId);
       if (!bookmark)