views/examples: Clean up cpplint warnings.

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/utf_string_conversions.h"
 #include "ui/views/controls/menu/menu_model_adapter.h"
 #include "ui/views/controls/menu/menu_runner.h"
 #include "ui/views/controls/tree/tree_view.h"
-#include "ui/views/controls/tree/tree_view.h"
 #include "ui/views/layout/grid_layout.h"
 
 namespace views {
 namespace examples {
 
 TreeViewExample::TreeViewExample()
     : ExampleBase("Tree View"),
       tree_view_(NULL),
       model_(new NodeType(ASCIIToUTF16("root"), 1)) {
 }
@@ skipping 142 matching lines @@
     case ID_ADD:
       AddNewNode();
       break;
     default:
       NOTREACHED();
   }
 }
 
 }  // namespace examples
 }  // namespace views