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

ui/views/controls/menu/menu_controller_unittest.cc

Index: ui/views/controls/menu/menu_controller_unittest.cc
diff --git a/ui/views/controls/menu/menu_controller_unittest.cc b/ui/views/controls/menu/menu_controller_unittest.cc
index e43aa59cb585a8876f5d96c754f08e353e5081ae..2db6591a9ce6b673727d9af464d8c20be6f13ea6 100644
--- a/ui/views/controls/menu/menu_controller_unittest.cc
+++ b/ui/views/controls/menu/menu_controller_unittest.cc
@@ -1393,6 +1393,12 @@ TEST_F(MenuControllerTest, RunWithoutWidgetDoesntCrash) {
 // 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)));