Fix a crash on triggering bookmark menu directions by the arrow keys.

chrome/browser/ui/gtk/bookmarks/bookmark_bar_gtk.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/gtk/bookmarks/bookmark_bar_gtk.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
@@ skipping 401 matching lines @@
 void BookmarkBarGtk::PopupForButtonNextTo(GtkWidget* button,
                                           GtkMenuDirectionType dir) {
   const BookmarkNode* relative_node = GetNodeForToolButton(button);
   DCHECK(relative_node);
 
   // Find out the order of the buttons.
   std::vector<GtkWidget*> folder_list;
   const int first_hidden = GetFirstHiddenBookmark(0, &folder_list);
   if (first_hidden != -1)
     folder_list.push_back(overflow_button_);
-  folder_list.push_back(other_bookmarks_button_);
+
+  if (!model_->other_node()->empty())
+    folder_list.push_back(other_bookmarks_button_);
 
   // Find the position of |button|.
   int button_idx = -1;
   for (size_t i = 0; i < folder_list.size(); ++i) {
     if (folder_list[i] == button) {
       button_idx = i;
       break;
     }
   }
   DCHECK_NE(button_idx, -1);
@@ skipping 1074 matching lines @@
 void BookmarkBarGtk::OnEditBookmarksEnabledChanged() {
   GtkDestDefaults dest_defaults =
       *edit_bookmarks_enabled_ ? GTK_DEST_DEFAULT_ALL :
                                  GTK_DEST_DEFAULT_DROP;
   gtk_drag_dest_set(overflow_button_, dest_defaults, NULL, 0, kDragAction);
   gtk_drag_dest_set(other_bookmarks_button_, dest_defaults,
                     NULL, 0, kDragAction);
   ui::SetDestTargetList(overflow_button_, kDestTargetList);
   ui::SetDestTargetList(other_bookmarks_button_, kDestTargetList);
 }