[Mac] Restore the old bookmark menus now that the experiment is over.

chrome/browser/ui/cocoa/bookmarks/bookmark_button.h

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_button.h
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_button.h b/chrome/browser/ui/cocoa/bookmarks/bookmark_button.h
index 6b5635b832707ae8756d3e3d112c4378b3de2a57..7bbfc9f2f25af88c459f5bde519da9dcf50a38bf 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_button.h
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_button.h
@@ -133,6 +133,12 @@ class ThemeProvider;
 // Return the theme provider associated with this browser window.
 - (ui::ThemeProvider*)themeProvider;
 
+// Called just before a child folder puts itself on screen.
+- (void)childFolderWillShow:(id<BookmarkButtonControllerProtocol>)child;
+
+// Called just before a child folder closes.
+- (void)childFolderWillClose:(id<BookmarkButtonControllerProtocol>)child;
+
 // Return a controller's folder controller for a subfolder, or nil.
 - (BookmarkBarFolderController*)folderController;