Added default implementations of GetAcceleratorForCommandId.

ui/views/examples/tree_view_example.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 "ui/views/examples/tree_view_example.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/views/controls/button/label_button.h"
 #include "ui/views/controls/menu/menu_model_adapter.h"
 #include "ui/views/controls/menu/menu_runner.h"
@@ skipping 135 matching lines @@
 }
 
 bool TreeViewExample::IsCommandIdChecked(int command_id) const {
   return false;
 }
 
 bool TreeViewExample::IsCommandIdEnabled(int command_id) const {
   return const_cast<TreeViewExample*>(this)->IsCommandIdEnabled(command_id);
 }
 
-bool TreeViewExample::GetAcceleratorForCommandId(
-    int command_id,
-    ui::Accelerator* accelerator) const {
-  return false;
-}
-
 void TreeViewExample::ExecuteCommand(int command_id, int event_flags) {
   NodeType* selected_node =
       static_cast<NodeType*>(tree_view_->GetSelectedNode());
   switch (command_id) {
     case ID_EDIT:
       tree_view_->StartEditing(selected_node);
       break;
     case ID_REMOVE:
       model_.Remove(selected_node->parent(), selected_node);
       break;
     case ID_ADD:
       AddNewNode();
       break;
     default:
       NOTREACHED();
   }
 }
 
 }  // namespace examples
 }  // namespace views