Cleanup shelf initialization and observation.

ash/test/test_shelf_delegate.cc

Index: ash/test/test_shelf_delegate.cc
diff --git a/ash/test/test_shelf_delegate.cc b/ash/test/test_shelf_delegate.cc
index 232c46c71c6541f7faac14e14bbe03a33bd67118..affed052373d01ea049eb0041b70d0bf636b2cad 100644
--- a/ash/test/test_shelf_delegate.cc
+++ b/ash/test/test_shelf_delegate.cc
@@ -90,11 +90,13 @@ void TestShelfDelegate::OnWindowHierarchyChanging(
     RemoveShelfItemForWindow(params.target);
 }
 
-void TestShelfDelegate::OnShelfCreated(Shelf* shelf) {
-}
+void TestShelfDelegate::OnShelfCreated(Shelf* shelf) {}
 
-void TestShelfDelegate::OnShelfDestroyed(Shelf* shelf) {
-}
+void TestShelfDelegate::OnShelfDestroyed(Shelf* shelf) {}
+
+void TestShelfDelegate::OnShelfAlignmentChanged(Shelf* shelf) {}
+
+void TestShelfDelegate::OnShelfAutoHideBehaviorChanged(Shelf* shelf) {}
 
 ShelfID TestShelfDelegate::GetShelfIDForAppID(const std::string& app_id) {
   for (auto const& iter : shelf_id_to_app_id_map_) {