stream: delete redundant code#18145

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MoonBall wants to merge 2 commits intonodejs:masterfrom

MoonBall:delete-redundant-code-in-Stream.Writable

Commits on Jan 14, 2018

stream: delete redundant code
陈刚
committed

Commits on Jan 15, 2018

stream: delete redundant code
陈刚
committed