mash: Convert AshPopupAlignmentDelegate to wm common types

ash/mus/bridge/wm_shelf_mus.h

Index: ash/mus/bridge/wm_shelf_mus.h
diff --git a/ash/mus/bridge/wm_shelf_mus.h b/ash/mus/bridge/wm_shelf_mus.h
index b5ab9213867f21fc22e6ea38efa1a4943b4efd34..0e1ff4bb6c8db38c07d77a94d4fe58a987244e56 100644
--- a/ash/mus/bridge/wm_shelf_mus.h
+++ b/ash/mus/bridge/wm_shelf_mus.h
@@ -30,9 +30,11 @@ class WmShelfMus : public WmShelf {
   void SetAlignment(ShelfAlignment alignment) override;
   ShelfAutoHideBehavior GetAutoHideBehavior() const override;
   void SetAutoHideBehavior(ShelfAutoHideBehavior behavior) override;
+  ShelfAutoHideState GetAutoHideState() const override;
   ShelfBackgroundType GetBackgroundType() const override;
   void UpdateVisibilityState() override;
   ShelfVisibilityState GetVisibilityState() const override;
+  gfx::Rect GetUserWorkAreaBounds() const override;
   void UpdateIconPositionForWindow(WmWindow* window) override;
   gfx::Rect GetScreenBoundsOfItemIconForWindow(WmWindow* window) override;
   void AddObserver(WmShelfObserver* observer) override;