Bug fix: Translate: leak of a ComboboxModel

ui/base/ui_base.gyp

 # Copyright 2014 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 191 matching lines @@
         'models/dialog_model.cc',
         'models/dialog_model.h',
         'models/list_model.h',
         'models/list_model_observer.h',
         'models/list_selection_model.cc',
         'models/list_selection_model.h',
         'models/menu_model.cc',
         'models/menu_model.h',
         'models/menu_model_delegate.h',
         'models/menu_separator_types.h',
+        'models/simple_combobox_model.cc',
+        'models/simple_combobox_model.h',
         'models/simple_menu_model.cc',
         'models/simple_menu_model.h',
         'models/table_model.cc',
         'models/table_model.h',
         'models/table_model_observer.h',
         'models/tree_model.cc',
         'models/tree_model.h',
         'models/tree_node_iterator.h',
         'models/tree_node_model.h',
         'nine_image_painter_factory.cc',
@@ skipping 407 matching lines @@
            ],
            'variables': {
              'jni_gen_package': 'ui',
            },
            'includes': [ '../../build/jni_generator.gypi' ],
          },
        ],
     }],
   ],
 }