go.net/html: don't use Go tip io.ByteWriter So that Go 1.0 user could also use this package. Fixes golang/go#4931.
go.net/html: don't use Go tip io.ByteWriter
So that Go 1.0 user could also use this package.
Fixes golang/go#4931.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/7424044

cesanta/goxnet,mckinney-subgraph/net,w4ngyi/net,zabawaba99/net,muzining/net,dafyddcrosby/net,foreversmart/net,yangxianjun/net,dafyddcrosby/net,veliamsli/net,kiip/net,mckinney-subgraph/net,foreversmart/net,gomini/net,zabawaba99/net,flowlo/go-net,cmars/tools,flowlo/go-net,albertjin/golang-net,golang/net,w4ngyi/net,albertjin/golang-net,raboof/net,chenzlabs/net,subuk/net,subuk/net,cmars/tools,chenzlabs/net,yangxianjun/net,kiip/net,cesanta/goxnet,DramaFever/golang.org-x-net,raboof/net,muzining/net,gomini/net,cmars/tools,DramaFever/golang.org-x-net,cmars/tools,veliamsli/net