Set the parent of BookmarkContextMenu to be the browser window, not

chrome/browser/gtk/bookmark_menu_controller_gtk.cc

Index: chrome/browser/gtk/bookmark_menu_controller_gtk.cc
diff --git a/chrome/browser/gtk/bookmark_menu_controller_gtk.cc b/chrome/browser/gtk/bookmark_menu_controller_gtk.cc
index 8c12c58871ead20290f93962e550ffe31c65dfbd..ce2a22ca0c8fb2b75861b8c6a6ae9480d1ac17e7 100644
--- a/chrome/browser/gtk/bookmark_menu_controller_gtk.cc
+++ b/chrome/browser/gtk/bookmark_menu_controller_gtk.cc
@@ -243,8 +243,8 @@ gboolean BookmarkMenuController::OnButtonPressed(
       nodes.push_back(node);
     controller->context_menu_.reset(
         new BookmarkContextMenu(
-            sender, controller->profile_, controller->browser_,
-            controller->page_navigator_, parent, nodes,
+            GTK_WIDGET(controller->parent_window_), controller->profile_,
+            controller->browser_, controller->page_navigator_, parent, nodes,
             BookmarkContextMenu::BOOKMARK_BAR));
 
     // Our bookmark folder menu loses the grab to the context menu. When the