ash: Convert ShelfDelegate to use WmShelf* instead of Shelf*

ash/shelf/shelf_view_unittest.cc

Index: ash/shelf/shelf_view_unittest.cc
diff --git a/ash/shelf/shelf_view_unittest.cc b/ash/shelf/shelf_view_unittest.cc
index 669927f5ab1cbeaf94c72ee59a93dcd4ee8da1d2..8f932350bb1ba62e9bf03a19bfcd8b45c8c7aec5 100644
--- a/ash/shelf/shelf_view_unittest.cc
+++ b/ash/shelf/shelf_view_unittest.cc
@@ -249,17 +249,17 @@ class TestShelfDelegateForShelfView : public ShelfDelegate {
   void set_is_app_pinned(bool is_pinned) { is_app_pinned_ = is_pinned; }
 
   // ShelfDelegate overrides:
-  void OnShelfCreated(Shelf* shelf) override {}
+  void OnShelfCreated(WmShelf* shelf) override {}
 
-  void OnShelfDestroyed(Shelf* shelf) override {}
+  void OnShelfDestroyed(WmShelf* shelf) override {}
 
-  void OnShelfAlignmentChanged(Shelf* shelf) override {}
+  void OnShelfAlignmentChanged(WmShelf* shelf) override {}
 
-  void OnShelfAutoHideBehaviorChanged(Shelf* shelf) override {}
+  void OnShelfAutoHideBehaviorChanged(WmShelf* shelf) override {}
 
-  void OnShelfAutoHideStateChanged(Shelf* shelf) override {}
+  void OnShelfAutoHideStateChanged(WmShelf* shelf) override {}
 
-  void OnShelfVisibilityStateChanged(Shelf* shelf) override {}
+  void OnShelfVisibilityStateChanged(WmShelf* shelf) override {}
 
   ShelfID GetShelfIDForAppID(const std::string& app_id) override {
     ShelfID id = 0;