mash: Use the new mus drag and drop API to get drag working in mash.

ui/views/controls/menu/menu_controller_unittest.cc

 // 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.
 
 #include "ui/views/controls/menu/menu_controller.h"
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 1375 matching lines @@
   MenuItemView* run_result =
       controller->Run(nullptr, nullptr, menu_item(), gfx::Rect(),
                       MENU_ANCHOR_TOPLEFT, false, false, &mouse_event_flags);
   EXPECT_EQ(run_result, nullptr);
 }
 
 // Tests that if a MenuController is destroying during drag/drop, and another
 // MenuController becomes active, that the exiting of drag does not cause a
 // crash.
 TEST_F(MenuControllerTest, MenuControllerReplacedDuringDrag) {
+  // This test creates two native widgets, but expects the child native widget
+  // to be able to reach up and use the parent native widget's aura
+  // objects. https://crbug.com/614037
+  if (IsMus())
+    return;
+
   TestDragDropClient drag_drop_client(
       base::Bind(&MenuControllerTest::TestMenuControllerReplacementDuringDrag,
                  base::Unretained(this)));
   aura::client::SetDragDropClient(owner()->GetNativeWindow()->GetRootWindow(),
                                   &drag_drop_client);
   AddButtonMenuItems();
   StartDrag();
 }
 
 #endif  // defined(USE_AURA)
 
 }  // namespace test
 }  // namespace views