mash: Remove ShelfDelegate; move functions to ShelfModel.

ash/test/shelf_view_test_api.cc

Index: ash/test/shelf_view_test_api.cc
diff --git a/ash/test/shelf_view_test_api.cc b/ash/test/shelf_view_test_api.cc
index 9bf2d8c7e260696b465a4da5f1da7bbb2acbc25e..2ddb9c478758e87b7a5a116a4aadc0c3b78f4b27 100644
--- a/ash/test/shelf_view_test_api.cc
+++ b/ash/test/shelf_view_test_api.cc
@@ -150,10 +150,6 @@ bool ShelfViewTestAPI::SameDragType(ShelfItemType typea,
   return shelf_view_->SameDragType(typea, typeb);
 }
 
-void ShelfViewTestAPI::SetShelfDelegate(ShelfDelegate* delegate) {
-  shelf_view_->delegate_ = delegate;
-}
-
 gfx::Rect ShelfViewTestAPI::GetBoundsForDragInsertInScreen() {
   return shelf_view_->GetBoundsForDragInsertInScreen();
 }