mash: Use mojo for ShelfItemDelegate and [app] MenuItem.

ash/shelf/shelf_unittest.cc

Index: ash/shelf/shelf_unittest.cc
diff --git a/ash/shelf/shelf_unittest.cc b/ash/shelf/shelf_unittest.cc
index 060018c6988521e5f0818d7087b48957caa9162b..bc15e772181c8f0625e9fb9e39f36e5eab14f59e 100644
--- a/ash/shelf/shelf_unittest.cc
+++ b/ash/shelf/shelf_unittest.cc
@@ -72,10 +72,9 @@ TEST_F(ShelfTest, CheckHoverAfterMenu) {
   item.status = STATUS_RUNNING;
   int index = shelf_model()->Add(item);
 
-  std::unique_ptr<ShelfItemDelegate> delegate(
-      new test::TestShelfItemDelegate(NULL));
-  shelf_model()->SetShelfItemDelegate(shelf_model()->items()[index].id,
-                                      std::move(delegate));
+  shelf_model()->SetShelfItemDelegate(
+      shelf_model()->items()[index].id,
+      base::MakeUnique<test::TestShelfItemDelegate>(nullptr));
 
   ASSERT_EQ(++button_count, test_api()->GetButtonCount());
   ShelfButton* button = test_api()->GetButton(index);