Dart

Fix base class in networker #240

Job	Run time
build (packages/consoler)	42s
build (packages/dart_leap)	42s
build (packages/flutter_localizer)	43s
build (packages/localizer)	47s
build (packages/lw_file_system)	50s
build (packages/lw_file_system_api)	43s
build (packages/lw_sysapi)	55s
build (packages/generate_leap)	43s
build (packages/material_leap)	59s
build (packages/networker/networker)	45s
build (packages/networker/networker_crypto)	43s
build (packages/networker/networker_rtc)	47s
build (packages/networker/networker_socket)	46s
build (packages/networker/networker_s5)	47s
	10m 52s

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