mash: Migrate shelf menus to wm common types

ash/test/test_shell_delegate.cc

Index: ash/test/test_shell_delegate.cc
diff --git a/ash/test/test_shell_delegate.cc b/ash/test/test_shell_delegate.cc
index 916e0f68dbf1dde893f960ebf6f3172c2b08fda1..545d2d198bb0362ae3b1449e3a38bcbe71bc12a5 100644
--- a/ash/test/test_shell_delegate.cc
+++ b/ash/test/test_shell_delegate.cc
@@ -216,9 +216,8 @@ TestShellDelegate::CreatePointerWatcherDelegate() {
   return base::WrapUnique(new PointerWatcherDelegateAura);
 }
 
-ui::MenuModel* TestShellDelegate::CreateContextMenu(
-    ash::Shelf* shelf,
-    const ash::ShelfItem* item) {
+ui::MenuModel* TestShellDelegate::CreateContextMenu(WmShelf* wm_shelf,
+                                                    const ShelfItem* item) {
   return nullptr;
 }