mash: Migrate shelf menus to wm common types

ash/test/test_shell_delegate.h

Index: ash/test/test_shell_delegate.h
diff --git a/ash/test/test_shell_delegate.h b/ash/test/test_shell_delegate.h
index 6797c913872520e31434aadeb734e30b79c03a3a..b2957ee63e0c05e6c3d464a49d3e5ee3dc1a775b 100644
--- a/ash/test/test_shell_delegate.h
+++ b/ash/test/test_shell_delegate.h
@@ -64,8 +64,8 @@ class TestShellDelegate : public ShellDelegate {
   std::unique_ptr<ContainerDelegate> CreateContainerDelegate() override;
   std::unique_ptr<PointerWatcherDelegate> CreatePointerWatcherDelegate()
       override;
-  ui::MenuModel* CreateContextMenu(ash::Shelf* shelf,
-                                   const ash::ShelfItem* item) override;
+  ui::MenuModel* CreateContextMenu(WmShelf* wm_shelf,
+                                   const ShelfItem* item) override;
   GPUSupport* CreateGPUSupport() override;
   base::string16 GetProductName() const override;
   gfx::Image GetDeprecatedAcceleratorImage() const override;