fix #2473

Job	Run time
examples (packages/flutter_bloc/example)	1m 0s
examples (examples/flutter_bloc_with_stream)	1m 25s
examples (examples/flutter_complex_list)	1m 21s
examples (examples/flutter_counter)	1m 21s
examples (examples/flutter_dynamic_form)	1m 39s
examples (examples/flutter_firebase_login)	1m 45s
examples (examples/flutter_form_validation)	59s
examples (examples/flutter_infinite_list)	1m 29s
examples (examples/flutter_login)	1m 26s
examples (examples/flutter_shopping_cart)	1m 26s
examples (examples/flutter_timer)	1m 18s
examples (examples/flutter_todos)	1m 42s
examples (examples/flutter_todos/packages/local_storage_todos_api)	1m 10s
examples (examples/flutter_todos/packages/todos_api)	57s
examples (examples/flutter_todos/packages/todos_repository)	57s
examples (examples/flutter_weather)	1m 38s
examples (examples/flutter_wizard)	1m 12s
examples (examples/github_search/flutter_github_search)	58s
build	2s
	23m 45s

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