Fix loss of mouse events when an Aura combobox is open in a modal dialog

ui/views/controls/combobox/native_combobox_views.cc

 // Copyright (c) 2011 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/controls/combobox/native_combobox_views.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/utf_string_conversions.h"
@@ skipping 343 matching lines @@
   gfx::Rect lb = GetLocalBounds();
   gfx::Point menu_position(lb.origin());
   View::ConvertPointToScreen(this, &menu_position);
   if (menu_position.x() < 0)
       menu_position.set_x(0);
 
   gfx::Rect bounds(menu_position, lb.size());
 
   dropdown_open_ = true;
   if (dropdown_list_menu_runner_->RunMenuAt(
-          NULL, NULL, bounds, MenuItemView::TOPLEFT,
+          GetWidget(), NULL, bounds, MenuItemView::TOPLEFT,
           MenuRunner::HAS_MNEMONICS) == MenuRunner::MENU_DELETED)
     return;
   dropdown_open_ = false;
 
   // Need to explicitly clear mouse handler so that events get sent
   // properly after the menu finishes running. If we don't do this, then
   // the first click to other parts of the UI is eaten.
   SetMouseHandler(NULL);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeComboboxWrapper, public:
 
 #if defined(USE_AURA)
 // static
 NativeComboboxWrapper* NativeComboboxWrapper::CreateWrapper(
     Combobox* combobox) {
   return new NativeComboboxViews(combobox);
 }
 #endif
 
 }  // namespace views