Use the managed bookmarks icon for its folder on Mac.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.mm
index 77d8ba115eb0b68db5053f30f785b4080cee8664..8146371fd3cfd914d5bdf898144f2cd50a732040 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.mm
@@ -582,8 +582,12 @@ void RecordAppLaunch(Profile* profile, GURL url) {
   if (!node)
     return defaultImage_;
 
-  // TODO(joaodasilva): return the "Managed Bookmarks" icon here for the
-  // managed node.
+  if (node == bookmarkClient_->managed_node()) {
+    // Most users never see this node, so the image is only loaded if needed.
+    ResourceBundle& rb = ResourceBundle::GetSharedInstance();
+    return rb.GetNativeImageNamed(IDR_BOOKMARK_BAR_FOLDER_MANAGED).ToNSImage();
+  }
+
   if (node->is_folder())
     return folderImage_;